T-Mobile is the brand name used by some of the mobile communications subsidiaries of the German telecommunications company Deutsche Telekom AG in the Czech Republic, Poland, and the United States, and by the former subsidiary in the Netherlands.
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Can I use any cell phone with T-Mobile?
A device must be unlocked to be compatible with the T-Mobile network. Check out Unlock your mobile wireless device if needed. T-Mobile can’t provide an unlock code, contact the original carrier to request an unlock code.
Can I keep my number if I switch to T-Mobile?
Yes, it is possible to keep the number you already have from another wireless or landline carrier. First, check if your existing number is eligible for transfer to T-Mobile. If it is, simply follow the on-screen instructions displayed during check-out to authorize the transfer. We’ll do the rest.
If you’re switching service providers and remaining in the same geographic area, you can keep your existing phone number. This process – often referred to as phone number porting – can be done between wireline, IP, and wireless providers.


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