Hi, i own a 4s iphone in venezuela but right here we have so much network problems because there are really not stable so my iPhone and iPad swift automatic from 3G to EDGE while surfing or chatting so it turns the iPhone really slow , the thing is i want to know if theres any app or way to choose the iPhone just to get conected just in 3G or 2G or both like the blackberry? ill be a very sold app i guess.