If it's already locked on their network - yes. If it's on another carrier's network - no.
When you insert a T-Mobile SIM card into a locked iPhone, the device will typically display a message indicating that the SIM card is not supported or that the phone is locked to a different carrier. The iPhone will not allow you to make calls, send texts, or use mobile data with the new SIM. To use the T-Mobile SIM, you'll need to unlock the iPhone from its original carrier, which usually involves meeting specific conditions set by that carrier.
I am pretty sure that all American carriers selling the iPhone use monthly plans for data, text, and minutes.
From iPhone 4 and beyond you can use simple software to unlock your phone. The 3GS is not able to unlock your phone unless you buy a special SIM card or take it to a different carrier
The monthly cost of an iPhone 6 will vary based on the carrier you use.
this depends on the carrier you will be using. the talking and texting part is about the same on att and verizon (~$50). what will vary is the Data. this will be different from carrier to carrier depending on how much you wish to pay for. sprint has their Unlimited everything plan for $70 a month i believe. an iphone 4s will work with sprint in this plan. please keep in mind that the iphone 4s is not a 4g phone on ANY carrier
If your SIM card is not working in your iPhone 3G, you should check with the dealer you got the phone from. It may need to be unlocked for use with a different carrier.
AT&T. But you can "unlock" an iPhone for verizon.
In theory, yes. T-Mobile is actually the carrier for the iPhone in Germany. Keep in mind, however, that unlocking an iPhone completely voids its warranty, and if anything happens to it, the only recourse is to purchase a new iPhone. Apple will not service a broken iPhone if it is unlocked.
I really don't know but I wouldn't think so unless your carrier would let you.
An Apple iPhone 3GS can be purcased unlocked without a SIM card and used with a local carrier's SIM card. Once purchased it is as simple as inserting a SIM card from the carrier of your choice.
Yes. Vodaphone now sells the iPhone.