I have a 3 gs and a 4 and all the home plug-in chargers don't work anymore. I've purchase (4) replacements and they all don't work either. It's the small 1 in. square type. I've tried genuine Apple and aftermarket ones and they all suck pretty bad. I can't seem to find any answers or good reviews on what's the best replacement choices. I'm new to this forum so I hope I'm following the rules and would appreciate any help. Thanks!