Unlocked iPhone 5 not working on other carriers.

I got my iPhone 5 unlocked from at&t. But when i try to use it on other networks like t mobile and ultra mobile, the phone throws "No Service" error. I reached out to both at&t and apple and they confirmed that the phone is unlocked. What may be the issue? Suggestions please..

<https://support.apple.com/HT202720>

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