Hello, I purchased my g-boom from target. every thing seemed fine until I went to charge my iphone. the usb port will not charge. so I returned it. and bought another one. well same thing is happening. so I have a half dozen cables. not the problem. I have 2 different phones, iphone 4s and a iphone 5. same problem. with different cables. which work fine everywhere else. I like the speaker but I feel cheated out of a charging device for my phone.