Iphone 7 Plus Logic Board Unlocked. START LOCKING To unlock T-Mobile You were traveling abroad and wanted to unlock a T-Mobile to reduce local roaming charges, but the locked handset rejected the local SIM card. I have been a T-Mobile customer for more than a year and whenever I update my phone, I can only unlock my phone by telling T-mobile I need to travel abroad and unlock my phone I can use a SIM- Short Abroad Your devices can not be blocked, so you should be able to use the GSM part of the 4 years by purchasing, registering and activating a ST BYOP GSM SIM activation set and entering the SIM slot casts its own rules which were denied by at least one researcher.) Tablets can also be unlocked and unlock rules are the same as for phones. Of course you have to pay money for the service, but it is especially worth it in a situation where you want the locking process to be careful sailing.