I've been meaning to upgrade for a while now and I was thinking of buying the 7 Plus. However, the whole "buzzing noise" in those phones has me worried, I'm not really sure now because I'm not from the US and if I buy one I don't think I'm gonna be able to get it replaced. Is this happening to all phones, or only a few ones? I'm not sure if I should take the chance. Or should I just get the 7?