Which carrier does PC Mobile use?

Need to find out what carrier pc mobile uses in order to download data from a phone that is blocked. It's on but does come to the home screen....

My cellphone is broken beyond repair, so my question is can I take my SIM card out and use it in a different cell phone that isn't the same cell as my other one? ...( I am currently with pc mobile......but I would like to get a different model, a different phone entirely. need help and answers ASAP. Please and ThankYou. .signed: Not Happy In Newfoundland'

Since PC Mobile Prepaid uses Bell, Could I buy a Samsung Ativ S, for example, from Bell and use it for my PC Mobile Prepaid account ? Would I just need a PC Mobile SIM card ?

PC mobile postpaid uses the TELUS network

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