Assisted Dying, Here's Where It...
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No best answer has yet been selected by andy12437. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I don't know the answer to your question, but an easy way for you to find out is to put your friend's tesco sim card in your phone. If it works then that means you can use all tesco sims.
Also its not necessarily a question of ALL O2 phones being locked. It depends entirely on where you buy it from, some retailers sell the phones locked to particular networks, some don't,