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Do unlocked phones "relock"?

i'm wanting to unlock my phone from its existing tesco PAYG network to operate with an o2 PAYG sim card. Does anyone know if when my phone is unlocked that it is unlocked permanently or will it relock to the network of the next sim card i put in?

I'm wanting to us the same phone but in order to take advantage of the o2 broadband discounts i need to have an o2 phone (that i'll use first to spend the minimum credit i need to spend in order to qualify for the bb discount) but the rest of the time i'll use my existing tesco card as it's cheaper.

Thanks...

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