A few questions about unlocked or unlocking a phone

[patricem]

1) When you buy a 'no sim' phone from Apple, does that mean it can be used on any network, GSM or CDMA, and you can switch when you want from one to another?

2) If you buy a used phone that is locked to a network but paid in full, can you unlock it to use on a different network?

3) Once a Sprint phone is unlocked, it can be used on any GSM network, correct?

4) Has anyone used or tried US Mobile?

Thank you in advance for answering.

 

[wongster]

1. yes
2. think you'll have to have the original owner unlock it
3. yes from iPhone 6 and on
4. no

 

[BeeGood]

1. I think GSM carriers require a SIM card. Someone please correct me if I'm wrong
2. On AT&T, anyone can unlock the phone, but you need certain info that only the account holder would have, so basically, you'd want to get the seller to unlock before you buy.
3.Yes
4.No experience with them. Sorry.

 

[eyoungren]

1. I think GSM carriers require a SIM card. Someone please correct me if I'm wrong
2. On AT&T, anyone can unlock the phone, but you need certain info that only the account holder would have, so basically, you'd want to get the seller to unlock before you buy.
3.Yes
4.No experience with them. Sorry.

1. They do. But so do all LTE networks, regardless of whether the carrier is CDMA or not. LTE is a version of GSM.

 

[Applejuiced]

1) When you buy a 'no sim' phone from Apple, does that mean it can be used on any network, GSM or CDMA, and you can switch when you want from one to another?

2) If you buy a used phone that is locked to a network but paid in full, can you unlock it to use on a different network?

3) Once a Sprint phone is unlocked, it can be used on any GSM network, correct?

4) Has anyone used or tried US Mobile?

Thank you in advance for answering.

1 yes
2 depends on the model iPhone and what network is locked to.
3 no. Depends on the iPhone model.
4 never heard of that carrier.