it depends on where you are.it changes to strong signal to the nearest mast.and I think you have to have a credit of 200 for you to be able to use your phone here and dont forget it cost you about 25 peso I think/text message and if your credit zero u cant recieve any text or phone call from home thru your roaming sim.thats the reason i have stop using mine and I switch to mibile world.you could go to your nearest carphone warehouse for deatils.hope that hepls.
