What are Sim card companies in America?

my sim card like messed up and now I need a new one. how much are they ?

How much is a sim card and how much is it to activate it?

does the samsung sch u740 alias cell phone take sim card

Can you only buy only the sim card (prepaid ) for the sidekick 3? well I have a sidekick as a gift but I want to connect i...

heeya :D I am currently searching ebay for a hello kitty phone which I want to get but I am on a contract with o2, does anyo...

I have a samsung tmobile phone and I want to put my unicel sim card in it, but when I do it says wrong card? is there an unlo...

I have a g1 phone wit tmobile and I like to save my numbers 2my sim card because in the pass saving it only 2my phone they wo...

hi. i bought a new sim card for my orange pay as you go because i kept getting dodgy calls so i wanted to change my number. w...

Well im gunna get an Iphone but I have tmobile So I was wondering will it work with a tmobile sim card?

Can you put a prepaid sim card into a regular cell phone?