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Internet Sharing (Tethering) - AT&T Branded - Carrier Unlock

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By patrick.l.vogt, Junior Member on 6th August 2013, 05:22 AM
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A while back, AT&T began offering unlock codes to Lumia 900 owners who either bought the phone outright or had satisfied the requirements of their contract. This has opened the door to using this device on other GSM carriers.

If you are using AT&T as your carrier, or an AT&T MVNO (such as Straight Talk or Net 10), you might want to stop reading. I was a subscriber to Straight Talk and never got Internet Sharing to work on my Lumia. Proceed at your own risk of frustration.

This thread is intended to carefully document my experience getting Internet Sharing to work on my carrier unlocked Lumia 900.

If you wish to enable Internet Sharing:
  1. Call AT&T and ask for an unlock code. If you do not have a competitor SIM, you can produce the Unlock code prompt by dialing ##782# from the dialpad.
  2. Connect your phone to a PC and backup your photos, videos, and music. You'll be doing a Hard Reset soon.
  3. Remove the SIM and replace with a non AT&T SIM, such as T-Mobile.
  4. Perform a Hard (Factory) reset by going to Settings -> About -> More Info -> Reset.
  5. Perform the initial setup tasks using the advanced mode.
  6. Press and hold POWER to turn the phone off. After 30 seconds, turn phone back ON.
  7. After 1-2 minutes of the phone being powered on, be sure you have a data signal; verify this by opening a browser and navigating to a website.
  8. After verifying you have a data signal, attempt to enable Internet Sharing. Go to Settings -> Internet Sharing -> ON. The phone should show the Wait indicator for 5-10 seconds and then present the Wireless AP name, encryption type, and password. You can change these settings.

A word of warning: Do -not- install the Network Setup app. This will break Internet Tethering and lock your phone down tighter than Fort Knox. If for some reason install Network Setup out of curiosity (as I did), and break your tether, just do a hard reset and repeat the steps above (sans the AT&T unlock code entry business.) The Lumia should grab all the network setup data it needs from the inserted SIM at first boot. If you change SIMS, you'll need to do another hard reset; it is speculated that the LUMIA does not update network settings when a new SIM is inserted.
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6th August 2013, 06:04 PM |#2  
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Interesting development: when the phone is displaying 4G data connectivity, Internet Sharing turns on successfully. When the phone switches to LTE, internet sharing is not possible; the AT&T message is displayed.
7th August 2013, 02:54 AM |#3  
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It did not work for me. My Lumia 900 RM-823 was already carrier unlocked and upgraged to Windows Phone 7.8. Tried twice after reseting to factory settings and started from scratch.

Anyone else had any luck?? If yes, could you please specify how it was done??
10th October 2013, 10:09 PM |#4  
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THANK YOU, patrick. Followerd your instructions and "Voila!". Unlocked Lumia 900 AT&T
18th October 2013, 03:39 AM |#5  
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Quote:
Originally Posted by inlore

THANK YOU, patrick. Followerd your instructions and "Voila!". Unlocked Lumia 900 AT&T

No luck on my end either. I had upgraded and installed the Nokia Network Setup to access the 4G on Tmobile, but even after a hard reset I am still unable to access internet sharing....

Anyone?
28th October 2013, 07:51 PM |#6  
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it seem that if when the cellular network is under LTE. the internet sharing wont turn on and that message about call 611 comes up.

but if you network select t-mobile under the cellular setting. the internet sharing works. but only for a moment until the cellular network automatically switches back to the LTE network.

that's what i've notice so far. anyone else?

---------- Post added at 11:51 AM ---------- Previous post was at 11:20 AM ----------

it seems that as long as it read 4g at the top corner. you can access the internet share menu.

another thing i notice is that if you connect another device to the nokia 900 and the cellular service switch to LTE your device still has internet option.

so it seems the problem here is making sure you are in the 4g network for you to have the internet share menu to work for you.
10th May 2014, 10:00 PM |#7  
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Tethering unlocked lumia 900
Quote:
Originally Posted by patrick.l.vogt

Interesting development: when the phone is displaying 4G data connectivity, Internet Sharing turns on successfully. When the phone switches to LTE, internet sharing is not possible; the AT&T message is displayed.

After getting the unlock code and putting in a t-mobile sum card the tethering would work on the t-mobile network. Interestingly enough it would not work on the at&t network because I was not paying for that and it would tell me to call.
AFTER, I installed the Nokia network app and selected at&t LTE it would tether.
31st December 2015, 05:36 PM |#8  
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Internet Sharing (Tethering locked to at&t) Lumia 900 Unlocked
I have a Lumia 900 and it is unlocked and works with other SIM cards all over the world. OS is 7.10 and firmware 2175.2307.8862.13100.
I have factory reset the phone to try and get the tethering to work but it will not. I get a message (CONNECTION NOT SHARED_ to enable tethering on this device, go to att.com/mywireless or dail 611). How can i get around this to get the internet sharing to work ?? I got the APN info from my service provider and i can use internet explorer on the phone using the data from the sim.

PLEASE HELP, SO THAT I CAN TETHER THE SIM CONNECTION TO ANOTHER DEVICE.
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