i have a samsung galaxy note sgh-i717. it's at&t but ive been using it on t-mobile. everything was working fine up until earlier this week. i have not done ANY rooting or customizing at all but i keep getting no sim error. this error pops up randomly a couple times a day. i have a micro sim that i cut myself but i have that sim tray thing that holds it in place so im sure it isnt a matter of the sim card sliding out of place. but i just cant figure out why this is happening. can someone,.. anyone,, please help me!??