In article . com, AlanC
writes

and if it's already unlocked, just stick the SIM in and try it. Can't do any
harm, can it?

John.

3 dont use SIMS, they use something called a USIM.

I have read posts in various groups about people damaging their (non
3) phone by putting a USIM in it. I have tried it (before I read the
posts) and it didnt damage my old SE.

I also think its against the terms and conditions of the contract. I
beleive that when a 3 phone doesnt have a 3G signal it uses the O2
network, which costs 3 more money. By putting the 2 USIM in a non 3G
phone, you will be using the O2 network.

I am no expert in this, this is just what I have picked up from
reading other posts when I was given a 3 phone by my brother. I
wanted to stick with Orange but couldnt as no one could unlock phones
on 3.


What's the original problem is it the 3 network or the phone?....
--
Tony Sayer