I have a SE K750i which I got from Orange, it is now unlocked & de-branded, the signal strength is not so good on other networks, ie, O2, Vodafone & T-Mobile, does the signal strength rely soley on the sim card or is it combined with the phone, so if you have an Orange phone & put a O2 sim card in it the signal won't be as good if it is not an O2 phone.
Steve
Steve