Rogers owns Chatr. This is why you would seem Rogers on there.. Where did you buy the phone from? a Rogers store or a Chatr store? You can not unlock the phone. The only way to unlock it is via jailbreak & i really dont know if they found a unlocking yet for the 4S. Sorry bud.
In you first post you mention it is a factory unlocked phone but then say it is locked to Rogers. If it is locked, you cannot unlock it, only Rogers can. If it is unlocked, you don't need to unlock it.
Where did you buy it from? If you paid $650 directly to Rogers and it is locked, then you can call them up and ask them to unlock it for $50. You need to have an existing Rogers account in good standing and the phone has to have been non-subsidized.
@kwRogers. You need to have bought the phone outright & in the end of your contact OR leaving the country ( which he has) in order for Rogers to unlock it for you for $50. This is what i & every one else has heard from Rogers.
IF he bought it from Apple then it should have been unlocked. If from Rogers then he needs to contact them but rules are rules right?
"I bought a Iphone4S , Seri MD241C is factory unlocked. Carrier: Rogers . But i can't to use with rogers sim and any other sim ( Sim not valid ), Chatr only. i 'm in VietNam now ! Help me unlock my phone! thanks"
IF you read his first post he says it can be used with Chat-R but it does NOT work for Rogers. That kinda is weird how it does not work with Rogers yet with Chat-r. He needs to contact the store / place he bought the phone from.