Hey everyone... I just spent a good bit of time surfing/searching the forums for a problem similar to mine, but found none. ATT tech help hasnt been much help as of yet, but Im going to try to call one more time today.
My phone is a Lumia 920 with the latest updates. I have NOT installed the APN settings app or anything like that. I have a 10GB shared data plan with my wife.
Here is the issue...if I have recently power cycled my phone, I can go to internet sharing, turn it on, connect whatever I want to my phone, and it works perfect. I can then finish, turn off internet sharing (or let it time out), and later turn it back on again...MAYBE.
Sometimes it will let me connect 2 or 3 more times, then I get the standard error message "Connection Not Shared. To enable tethering on this device, go to att.com/mywireless or dial 611.". If I power cycle the phone though, I am able to tether again just fine for a few sessions.
Anyone else having this intermittent issue? I dont want to have to keep power cycling my phone. Thats a PITA and in my opinion unnecessary. Im tethering to a Nexus 7 when I do it...and between this issue and NFC being lame, Im about to switch to a Galaxy phone haha. And I LOVE my WP8, so that hurts for me to say!