Those unlock services sound fishy. Do you know of any that is trustable?
Is there any other way for these services NOT to sound?
Think about it…
The unlock company secretly hires employees of the carrier company to secretly and without authorization submit IMEI addresses through the carrier's systems to Apple. How is that NOT fishy? For any unlock company?
You just have to decide which unlock company is serving YOU more than they are themselves.
I've heard of swiftunlocks.com and I've heard of chronicunlocks.com. Both have been advocated here at one time or another. I don't use unlock services though so no idea how reputable.
I can say that three employees from AT&T were fired over a year ago and Swift Unlocks was sued by AT&T. Those three employees were paid by Swift Unlocks to install "malware" on their workstations so that IMEIs could be submitted through AT&T 24/7.
AT&T only found out because those workstations were active during non-work hours. One of the fired employees only took employment for the specific purposes of submitting unlocks for Swift Unlocks.
All of that aside, for most people, none of this seems to be an issue and they get their unlock in a reasonable amount of time for a reasonable price.
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I was with Sprint earlier, my sister lost her iPhone 5 and when it was returned to her we had already switched to T-Mobile but Sprint refused to unlock it because we were no longer their customer even though it was paid off.
Going to speak to this since I was a Sprint customer for 16 years and the last three of those years I had an iPhone 5.
Because of the technical limitations designed into the Sprint iPhone 5 (at Sprint's request) and because of the way Sprint's network was at the time it is "technically'" impossible to unlock a Sprint iPhone 5 domestically. If you examine Sprint's unlock page the only thing they will give you for the Sprint iPhone 5 is the MSL code. Since Apple does not use MSL codes this is worthless.
Sprint CAN unlock an iPhone 5 internationally. The "technical" reasons are that the CDMA radio inside the Sprint iPhone 5 MUST be paired with the Sprint SIM card in order for the phone to function on Sprint's network. But the GSM part of the device can be unlocked for international use - hence being able to use the phone internationally.
But domestically, without the pairing of the SIM card and the phone it will not function on any network other than Sprint's.
My own Sprint iPhone 5 is still locked to Sprint but is internationally unlocked.
There is a caveat to this however. A loophole that somehow made it possible for the Sprint iPhone 5 to be unlocked domestically. Turns out that before Sprint slammed the door shut, some international unlocks got submitted as full unlocks. This had the effect of unlocking the phone domestically but killing any future use of the phone on Sprint.
The Sprint iPhone 4s is/was in the same boat while it's impossible to unlock the Sprint iPhone 4 because it does not have a SIM slot at all.