Can I connect my disconnected AT&T iPhone with another company?

I bought my friends disconnected iPhone 4 a month or two ago and she was selling it because she stopped paying for it I tried unlocking it and connecting it with tmobile or a prepaid company but the people that tried unlocking it told me the company( AT&T) locked the phone so it won't be connected again. I was just wondering if its even possible unlocking it anymore or connecting it through another company.

Yeah, just use Straight Talk. You don't need to bother unlocking it.

No you can't use straight talk or any att linked company like net10, red pocket, i think if you unlock the phone you will be able to use it for tmobile or simple mobile but please make sure first, i'm not 100% sure buh i think its gonna work, since your friend owe att money they bloocked the phone from there network but i think any other network shoud work.GL

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