When I go on holiday I usually use my iPhone with the O2 sim and it will swap to Movistar when I get there. Even though I am on unlimited texts to UK mobiles (capped at around 2000 I believe), it charges me to send texts, which I know it happens to everyone as it is outside the UK so obviously charges will always apply.
I have read posts about unlocking the iPhone, which I want to do as I have also read that, even though I purchased it unlocked from Apple, as soon as I put the O2 sim in it then it locked to O2.
My question is, if I get my phone unlocked and then when I am on holiday, could I purchase a Movistar sim and use it? Will my iPhone work with that sim? Will it be any cheaper for calls, texts and data? Movistar is the only network that I know in Spain.
I know that people recommend using wifi when possible and using apps like whatsapp, viber and bbm, however not everybody use that.
