Hi, I have an old unlocked ATT 4s and my wife's 4 is broken. I backed up her 4, updated to ios 8.1 and restored the backup on the 4s. I am getting "NO service" and "SIM NOT PROVISIONED" on 4s. Can I switch sims on 4 & 4s and then tell ATT the IMEI of the 4s? Is that the only way. Is there an easier way as she is asleep and I don't want to wake her with family plan account questions. Thanks.