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i had these probl;ems for months, no matter what firmware my iphone 3g was on, but i can tell you what i did to sort it out.
so you know i have tried 3 different types of these piggy back sims and have had 4 rebel sim things, but what i found out is its related to the 3g part
if you turn off 3g then all is fine and works well, apart from if you turn the phone off for more than an hour then you'll most probs have problems when you turn it back on like i did,
if 3g is turned on, for me this worked, you have to pop on a website, just any to create an active connection to the web and there calls came through and so did texts no probs, but again, if i dont touch the internet for about 1 hour, it stops working again, i my self am on orange, so i just went to the wap.orange.co.uk to create that connection, but when finished i turned off 3g to sort that problem out,
i originaly had a old payg orange 2.5g sim card (which cant use 3g modes) generaly had no problem at all with it and one of those piggy back sims, but again i wasnt able to use 3g anyway because of my old iorange sim... i then upgraded my sim card to a orange 3g sim so i can use 3g on the iphone, which is when i had this problem started, which was about 2 months after the iphone 3g came out... i have been on orange 3g contract now for 3 months, and again the problem you and i have/had, with the piggy back sims, including the rebel, on which ever firmware you wish, i have tried them all with no difference...
but a complete solution that has now worked perfectly, even with 3g turned on for days on end, i have no problem now
a goodstep to take, restore the latest update from apple (3.0) and let it do it properly, including the bassband update, when done dont restore backup, do this from fresh, best way i found.... using a o2 sim card, (i used a pay as you go you get free off the internet) to active the iphone properly... then jailbrake it using redsn0w the dev team released, once done, use cydia and install ultrasn0w, and bingo,
iphone unlocked with out no rebel crap or any other, and works perfectly.... made my iphone that one step better and im glad not to be using them crap piggy back sims no more
JUST MAKE SURE YOU DONT UPGRADE THE IPHONE TO THE 3.1 UPDATE WHEN IT COMES OUT, AS THIS WILL BRAKE THE ULTRASN0W UNLOCK,
look on this forum for a fix to the new update when it comes, to get ultrasnow working on newer update... (mostly by creating a custom firmware that does not update the bassband that apple would love you to have).
really hope this helps you out and fix tha problem once and for all like it has done me...
P.S. ultrasn0w only currently works on the iphone 3.0 update, so remember that.. or you'll most probs end up have to go back to a crap rebel or any other to use sims other than o2
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