The AT&T 3G MicroCell

Are you struggling with poor cellular phone reception inside your home or small office?  At the same time, do you have reliable broadband Internet service?  Then the answer to your cell phone problems may be as simple as installing a femtocell such as the AT&T 3G MicroCell, the Verizon Wireless Network Extender or the Sprint AIRAVE.  Think of a femtocell as your own personal cellular site based in your living room, that leverages your broadband Internet connection to route your phone calls back to the carrier’s network.  Instead of relying on a cell tower that may be blocks or miles away, you have one literally within arm’s reach.  Having had some extra time over Memorial Day weekend, I purchased and installed an AT&T 3G MicroCell for use in the living room in southwest Connecticut.

[Before we get started, we should note that that the term ‘microcell’ in telecommunications generally refers to a cell with a coverage area of between 200 meters and 2 kilometers.  AT&T’s “3G MicroCell,” on the other hand, has a range of around 40 feet from the device, or about 5000 square feet, typical of a femtocell.  AT&T’s use of the microcell nomenclature has been a source of contention in some on-line discussions.]

Acquiring the Device
AT&T 3G MicroCellAT&T doesn’t sell their 3G MicroCell via the web, so my adventure began by stopping in at a local AT&T Store to pick up the device.  I shelled out a one-time fee of $199.99 for the hardware, and was in and out of the store in about five minutes.  At least that’s how it should have gone.

In my particular case, this first 3G MicroCell turned out to have a defective Ethernet port, so I went through a round of troubleshooting at home that would be familiar to any technical professional but potentially frustrating for everyone else.  I then began this project anew back at the AT&T Store two hours later.  The second trip to the store took a little longer, as a sales professional exhibited what I interpreted as mild skepticism that the first device was truly defective.  It didn’t help that the pentaband 3G phone attached to my AT&T account at that time wasn’t one that AT&T has ever sold, so their computer warned them that it may not be a compatible 3G device.  Even so, this second visit didn’t last more than fifteen minutes.

At Home (The Second Time)
Once at home with a functional MicroCell in hand, setup was uncomplicated to anyone who has ever configured even the basic settings on a home router or wireless access point.

  1. We start by configuring the 3G MicroCell via the web before we ever physically connect or power on the device.  Begin by navigating to and choose the Activate button.
  2. You’ll have to identify whether you’re adding the 3G MicroCell to a personal or business account, at which point you’ll be prompted for your credentials to authenticate to that account.
  3. Next, you’ll have to provide the physical address where the device will reside, so that emergency personnel can locate you in the event that you ever call 911.  There’s no conceivable reason lie about your address, as the 3G MicroCell uses GPS to confirm its location.  (More on that in the next section.)  It is perfectly acceptable to register and install a 3G MicroCell at an address other than your current AT&T billing address.  For example, the billing address on my AT&T account is a PO box in Manhattan while I live in southwest Connecticut.
  4. Finally, you’ll want to specify any additional phone numbers beyond your own that you want to allow to use this device, up to ten in total.  After adding all the members of your household, you may wish to add your most frequent iPhone-toting guests to the list.  As the name implies with ‘AT&T’ and ‘3G’ in the description, only 3G phones on the AT&T network can work with the MicroCell.

Connecting the 3G MicroCell to Your Home Network

  1. As mentioned in the prior section, the 3G MicroCell uses GPS to validate it’s location for E911 compliance.  AT&T recommends that you place the MicroCell within 3 feet of a window in order to receive a GPS signal.  I set mine next to the cable modem and WiFi router, which happened to be around 8 feet from a southern wall that is predominantly windows.  It works just fine.  For those who wish to place the 3G MicroCell further away from a window or out of site, you may be able to use a 3rd-party GPS antenna to move the device further into your home while maintaining a GPS signal.
  2. In a perfect world, connecting your 3G MicroCell to your home network may be no more complicated than plugging it in to an available Ethernet port on your home router or wireless access point.  While I haven’t identified where AT&T explicitly states it, their instructions lead one to believe that the MicroCell uses UPnP to automatically open the necessary TCP/IP ports through many consumer-class routers.  For those who prefer to configure their firewall manually, you must open the following TCP/IP ports to this device as listed in the manual: 23/UDP, 443/TCP, 500/UDP and 4500/UDP.  Or there’s a third option…
  3. …If you wish to prioritize your call traffic over any of your other Internet traffic, as I do, AT&T supports connecting the 3G MicroCell between your cable/DSL modem and your home router/firewall/wireless access point.  The MicroCell has an in and an out Ethernet jack specifically for this scenario.  When connected in this manner, your phone call traffic can’t be stepped on by any large downloads or Netflix streaming that you do from time to time.
  4. Once you’ve got your device physically placed and connected to your network, it’s time to plug in the power.  The 3G MicroCell is ready for use only after all 5 lights have lit up green.  AT&T asks you to allow up to 90 minutes the first time around.  It took about 60 for me.  When all five lights are green, you’re ready to make or receive calls.

Using the 3G MicroCell
iPhone 4 connected to AT&T 3G MicroCellAs stated earlier, you can add up to a total of ten AT&T cell phone numbers to your 3G MicroCell during activation, or later on as needed.  Any phone on this list should automatically switch over to your 3G MicroCell shortly after coming within range.  You’ll know that your phone is connected when its screen indicates “AT&T MicroCell” or “AT&T M-Cell.”

Calls that you initiate while connected to the 3G MicroCell are supposed to be handed off to AT&T’s regular network if you leave home mid-call, however the reverse is not the case.  If you come within range of the MicroCell while talking through AT&T’s network, your phone won’t connect to the MicroCell until you terminate the current call.  And I’m not so sure that the call hand-off as you leave the MicroCell’s range actually works either, as I’ll touch on a couple of sections from now.  You may find it necessary to conduct each call in its entirety via the MicroCell if that’s where it was initiated.

Initial Impression
Where calling from the living room was hardly worth it before, calls there have been completely reliable since installing the 3G MicroCell.  That alone may validate the one-time cost of purchase for those who find themselves in a similar scenario.  When in the living room, I no longer have any concern as to my phone working clearly and reliably.

[Update 07/13: In using the MicroCell for over a month, I’ve noticed that it takes longer than usual to connect my first outbound call each time I come within range of the device.  Other than that and the ‘AT&T M-Cell’ denoted on my phone, I wouldn’t know the difference between this and good reception from AT&T’s traditional network.]

Signal Too Strong!?
Now I’m not actually the ideal candidate for the 3G MicroCell, and this is an important matter to consider before buying one.  AT&T recommends not using the MicroCell if you already have “3 bars” or more cellular coverage from their network.  The living room on the south end of my apartment had completely unreliable AT&T coverage, making it perfect for the MicroCell.  My bedroom on the north side of the building has a large window facing the street and a commuter rail line.  Not surprisingly, AT&T’s signal strength was nearly adequate on this edge of the apartment before the MicroCell.  Now I find that my phone is jumping back and forth between AT&T’s regular network and the MicroCell when in my bedroom, resulting in some dropped calls that aren’t really supposed to happen but do.  I’d be better off if AT&T’s terrestrial network coverage was abysmal throughout the apartment, letting the MicroCell’s performance really shine.

Is This for You?

  • You’re a current AT&T postpaid customer?
  • Your home or small office has lousy AT&T coverage inside such that your phone is not really usable?
  • You have reliable broadband Internet connectivity?
  • You can place your MicroCell within a few feet of a window or are willing to buy a 3rd-party GPS antenna?
  • Your family or team has less than 10 AT&T 3G cell phones that you need to cover, and plan to carry on no more than 4 simultaneous conversations?
  • You’re willing to make a 1-time investment of $199.99 to help enhance the AT&T cellular service that many consumers feel they’re already paying for?
  • (For those families who plan to use the MicroCell for heavy call volume, you may consider adding an optional $19.99 / monthly service fee for ‘AT&T Unlimited MicroCell Calling’ to your individual or family plan.)

Signing Off
A one-time investment of $199.99 for the AT&T 3G MicroCell has delivered reliable AT&T cellular coverage throughout the areas of my apartment where AT&T phones previously worked very poorly.  As experiments go, this one is a success.  If you’re struggling with poor indoor performance with your cell phone, perhaps this device or similar offerings from Verizon Wireless and Sprint are worth a look.

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  1. I must say this is a great article i enjoyed reading it keep the good work 🙂

  2. One of your best, to date. I’ve heard some of our network admins talk about microcells. This in-depth treatment really takes away the mystery.

  3. ThaoTam Tran says:

    Do I need 3g Data to let the word M-cell come up on my Iphone 4g? The word M-cell haven’t come up but my brother’s Iphone 4g already got M-cell.

  4. As ThaoTam Tran and I later found out through a series of e-mail exchanges, you must have 3G enabled on your iPhone 4 as shown in the following illustration.


  5. I don’t even know how I ended up here, but I thought this post was great. I don’t know who you are but certainly you are going to a famous blogger if you are not already 😉 Cheers!

  6. Actually, I totally agree with every aspect of this article. As a current 3G Microcell owner, I must say it definitely has more perks than not. For example, the connection does provide full signal strength. On the contrary, the microcell does not do a complete hand-off when switching from 3G to At&t service. It’s odd. Even still, I would not want to be stuck in this rural area without it. 🙂

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    Starting with registering the domain and designing the layout.

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  9. Jean Hines says:

    Good article. I recently purchased an AT&T Microcell and connected it to my wireless router. Yesterday, I purchased a Netgear Range Extender for improve the Wi-Fi service in my home. Can I move the Microcell from the router to the range extender?

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      • This sounds siimalr to the T-Mobile service I’ve been using for almost 2 years. There is no cell reception at my home so we make calls over broadband via a wireless router. Calls made over wi-fi are totally free except for international. I do not have to be home for free calling, the phone will make use of any open hotspot. We never go over our minutes.$79 per month for 300 minutes and 2 phones is pretty spiffy.

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  15. Robert,
    I have installed the 3G Mcell but we are having a few issues… Our house is 3,000 sq. ft. and we do have dropped calls from popping back and forth. I understand that being that we do have 3 bars of service in some areas.
    1) the voice seems to blank in and out, not static just silence, even if you are in the same room with the cell.
    2) our data (mainly texts) are not coming through very well. We will get a few with text only, but if it has attachments (pic., vcard, ect.) we don’t get them until we hop back on AT&T. for example: Yesterday I was home for 5 hours when I drove out of my drive way I received 5 text messages. 2 with pics and 3 with just text.
    Today I am connecting a gps antenna so I can place the Mcell closer to the center of our house.
    1) Is it OK to place the Mcell on a high object (on top of the cabnets) or would it me better in mid range?
    2) is it true to get the antenna as high as possible and in a window or just in a window?

    FYI~ you do a great job explaining things to those of us who are challenged in this IT world. Thank You’

    Respectfully ~C

    • Connie –

      1. Several factors could be in play here, but I’d guess that it has to do with your Internet bandwidth occasionally falling too low. What is your Internet bandwidth up/down? (You can run a test at Second, do you have a separate cable-modem and a router, or is it all integrated into a single box? In my case, I had a separate cable-modem and Wi-Fi router, so I connected the AT&T 3G MicroCell between the two. In this configuration, the MicroCell gets priority access to your Internet bandwidth, so that a family member watching Netflix streaming in the next room can’t degrade your call.

      2. If you have Wi-Fi at home, I suggest that you configure your phones to use Wi-Fi for their data while at home. This is particularly easy if you have an iPhone. Granted, traditional SMS text messages must still transfer via the cellular network (and MicroCell, if you have one) rather than Wi-Fi.

      3. I don’t know that the height at which you place the MicroCell is going to make a lot of difference, particularly if you have a multi-story house. I’ve got one at home at end-table height, and another sitting in a window ledge at the office.

      4. A GPS antenna should work anywhere that it has an unobstructed view of the sky.

      Best of luck,

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  17. I purchaced the 3gmicrocell about a year ago. I live in the country, 20 miles from any cell service. The 3g microcell has allowed meto get cell service and data at home.

    Sometimes I can walk 3 blocks away and pick up coverage of my microcell but its only one bar. On stormy, windy and freezing days I will drop calls some time. However I believe this is due to my internet service not the 3g tower.

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  25. Is there anyway to set the iPhone 4 to prioritize m-cell over tower? Tower service in my house has gotten slightly better in my house which has caused actual service to get worse since the phone now shows “3G” most of the time instead of “M-cell”. Any suggestions how to get it to stay on “M-cell” more?

  26. Do all microcell have to plugged into the router via cable. Do anyone make a wi fi microcell?

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