Can you unlock an iPhone twice?

Today I went to the apple store in the states with a cracked telus phone and they have me an AT and T phone which they put the telus sim in and restored it twice and now i guess it's unlocked on telus? In settings under carrier it says telus 13.0, since the SIM card was from an old phone and I'm currently on a bell contract is it possible to unlock from telus to bell to use this phone with it?

If it is unlocked so it will work with all Sim card, not need to unlocked it again.

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