my old iPhone 4s charger was broken yesterday, and now when i take out it to call my boyfriend, it shows in low power, and when i use my iPod charger to charge the 4s, no response... that's really terrible... so i wonder if there arecompatible USB Data Sync Charger Cable for iPhone 4S, iPhone 4, iPhone 3G/3GS, iPod? how much of them? thank you very much!