Unlcoked iphone from 02 to vodaphone, can i switch back?

I used to be on o2 on my iphone but didn't want to no longer, so i swapped sims and it wouldnt work so i got it unlocked. Now i have this new sim in i've had it for a while now, i'm thinking of possibly swapping back, will it lock to my o2 sim after so i can't change without paying again?

No it won't, once its unlocked you can put any sim in it

Your phone is already unlocked so you won't have any problems.

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