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Here is a post from the AT&T Forums indicating that this may indeed be an issue with AT&T recognizing the new nano-SIMs as this user claims to have his iPhone 5 working on the Microcell but using a cut-down iPhone 4 SIM.

Also, my iPhone 5 is recognized as a "flip-phone" icon with "iPhone 2" label showing on the AT&T user settings homepage - further indicating to me that AT&T is not recognizing iPhone 5 appropriately and this may be part of the Microcell issue we are experiencing.

From AT&T Forums:
"Gentleman, I dont belive this is a phone issue but more of a nano sim problem, I ordered my iPhone 5 using another lines upgrade, since the sim that came in the iPhone 5 was for the wrong number, I decided to cut my iPhone 4S's sim down to nano size and my iPhone 5 is working as it should on the Micro cell while my Brothers is not and he's using the sim that came with the iPhone 5. just my two cents..."
 
Same problem here, I got a iphone 5 and it will not connect to my microcell.
does at&t update the firmware? I've always wondered if I was supposed to manually update is someway.
 
Its something to do with the new sim card. I put my ip5 nano sim in my galaxy s3 with an adaptor and the microcell shows full service but when you try to call it says emergency calls only. Turn off the microcell I can call fine. Put the sim back in the ip5 and it shows no service on the phone
 
It HAS to be Micocell related since none of our iphones are now connecting to it. These include ip5, ip4 and x2 ip4s's.
 
AT&T support told me to "wait up to 2 hours for the new phone to connect". It's been 4 hours and I was just able to connect an old iPhone 4, but not the iPhone 5. Tried everything but remove my phone from the authorized numbers on the Microcell, as it is the primary number and there's no way of doing that short of removing the Microcell and adding it back in. AT&T support rep said this is the first they've heard of a problem with the iPhone 5...
 
I don't know? I used my ip4 with all of the io6's betas and didn't have any problems with the microcell. Hopefully At&t will find a fix I have had my ip5 for 4 hours now and have not got to make a call on it yet. LOL
 
I don't know? I used my ip4 with all of the io6's betas and didn't have any problems with the microcell. Hopefully At&t will find a fix I have had my ip5 for 4 hours now and have not got to make a call on it yet. LOL

Agreed. My iPhone 4 connected to the Microcell just fine after I updated to iOS6 (OTA).

I'm guessing it's an issue with the new sims. Hopefully it's a simple update on their end because I'm going to be very upset with AT&T otherwise.
 
I am not the administrator for the MicroCell at my office, but I had the administrator delete me, save, and then re-add me as a new user. I then turned off my iPhone5, turned it back on, and... NOTHING.

So, that doesn't work. Looks like maybe we're going to have to wait for AT&T to get their ish together before this happens.
 
iPhone 5 no M cell but my wife's 4s showing M Cell. I deactivated and activated and no go. Also I don't have LTe either. Not happy
 
iPhone 5 no M cell but my wife's 4s showing M Cell. I deactivated and activated and no go. Also I don't have LTe either. Not happy

I still can't deactivate the Microcell via At&t's site. I was told to "wait a couple of hours" too. Wife is not happy :-(
 
Hey folks:

Just got off the phone with AT&T. They said they were updating the Microcell systems because of problems occurring with the iPhone 5. The rep said they would follow up with me tomorrow to see if the problem was resolved. Hopefully this will be fixed within the day, she said they had been working on the system since earlier today.
 
What exactly does "Disconnect Your 3G MicroCell Device" mean or do? Once disconnected, How do you reconnect it?
 
Yet another...

I have the following on my MicroCell with the service noted:
iPhone 3GS - Connected and working on MicroCell
iPhone 4 - Connected and working on MicroCell
iPhone 4S - Connected and working on MicroCell
iPhone 5 - Will not connect to MicroCell
I will continue to monitor and report any changes.
 
I'm glad I found this thread. I was on AT&T with a 3GS a couple years back. I got no service in my home so we suffered with an inconsistent microcell for a few months until my wife and I were done with our contracts. We've been on Verizon with the ip4 and have good signal in the house. I was thinking about going back to AT&T for the ip5. My thought was that 4g coverage would be better and that we'd have a signal in our home but after reading this thread it seems like everyone who has a mc still needs them despite the switch from 3G to 4g. Is it safe to assume I would have the same experience?
 
AT&T called me back and said their Microcell system is down and will be for a while, that's why my iPhone 5 is not connecting. Hmmm... wonder why it's not down for all three of my iPhone 4's?
 
AT&T called me back and said their Microcell system is down and will be for a while, that's why my iPhone 5 is not connecting. Hmmm... wonder why it's not down for all three of my iPhone 4's?

Try rebooting your other phones and see if they still display the MicroCell icon.
 
This is such a joke. They should have been fully prepared for this. And that's BS that their microcell service is down or that they were updating it and something went wrong. My 4S was running ios6 w/ it this morning just fine. They know it's 5-specific, they just don't want to look so stupid.
 
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Total crap... they should have been well prepared for this. So typical of AT&T ***** service.

I chatted with AT&T customer service and got the same response as everyone else. To try again in a few hours.

I just tried to deactivate my MC and got this:

S100: We're sorry, but we are experiencing a temporary system error that prevents us from retrieving your account information. <br>(S100) [CFS|CancelFemtocellService|50000000284]
 
It's an ATT problem for sure

I called ATT this morning. They finally admitted it was a problem between the iPhone 5 and the Microcell. Since I have NO reception at home without the Microcell, I asked them to let me know if it would be fixed soon or if I needed to pick up a SIM card to reactivate my iPhone 4. They just left a message around 4p that I might want to pick up a SIM before ATT stores closed.

This sucks. I have no idea why they weren't prepared for this.
 
My AT&T iPhone 5 is working fine with my Microcell. I cut my 4S sim down to nano size, popped it in my 5, and it just worked.
 
My AT&T iPhone 5 is working fine with my Microcell. I cut my 4S sim down to nano size, popped it in my 5, and it just worked.

Yep, we've pretty much narrowed down the fact that the new sims are the issue. People who cut their old ones down aren't having problems.
 
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