I'll lose this if don't write here ) will check this one too for tmobile. The other trick doesn't help me anymore
Update. This is amazing. I just updated the Nokia settings apps and they seem to fix my Sharing. I didnt even try trick above))
I bought a 1520 and used my Cricket SIM and I couldn't get internet sharing to work but I could see it in the setting menu. After doing the official upgrade to 8.1 there is not even an option there to start internet sharing. Does anyone have any ideas?