Cell phones.

[jspeicher]

Can you just buy a mobile phone say from someone on forums and have it activated by your wireless provider - noting that they support and sell that particular phone model? Can it be a used phone?

 

[neonerd]

if it supports sim cards, and ur service provider has sim cards, then yes...you can transfer your old sim card to your new phone

 

[AdamSnow]

Yeah, you can do that... Doesnt need to use Sim cards either, they just activate the ID on the phone...

I did it just recently actually