I was having the popular USB not charging problem with my Sprint Touch Pro and I put on my thinking cap and come up with a nifty solution. Yes this topic has been posted in several threads, but I wanted to put this info into it's own thread so everybody can go to one thread to see what I have to suggest. First of all I will reconfirm some previously mentioned tips that various members have already suggested that are essential for USB charging.
1.) If and when possible, charged battery before tethering. (quite obvious I know)
2.) Turn off your display screen while tethering using the power button on top left corner.
3.) Make sure the USB drivers are all properly installed on your PC for your device.
4.) Keeping your phone cool is essential! If it gets too hot then the protection feature will kick in and you know how that goes. Improvise if necessary to keep your phone as cool as possible when doing heavy data streaming.
5.) When you connect your TP to your PC with the USB cable, you should always choose the "Disk Drive" connection NOT Activesync. Also when connected to your PC, you should see the circular light flashing in the usual rotating fashion the same way it does when you charge with your home ac adapter charger. If it's not then it's not charging. Check for other problems such as usb drivers, faulty usb cable, faulty usb port, etc.
Now that I have covered all those basics that most of you already know, heres the important piece of info that will put your tethering issues way behind you!!! I had the usb not charging suffeciently issue so I started brain storming. I used to be with Verizon and had a wireless usb720 modem that I used for my internet needs. That specific model usb modem comes with a special usb cable with dual male connectors on one end with the single female connector on the other end. The dual male ends both plug into two side by side usb ports. The main male usb connector serves as your main usb cable and can be use by itself. The second male usb connector is only capable of supplying "additional" power to the entire usb cable. So in other words with this special usb cable, you get twice the power to supply your phone with. This special usb cable was designed for this purpose to use with a wireless usb720 modem because they require more milliamps to get peak performance. So therefore I took this cable and took a chance on overpowering my phone and it works beautifully with no issues.
My "Sprint Speed" is faster than before. Go snag yourself one of these dual feed usb cables and give it a try!!! You will be happy you did. Just keep your phone cool if needed and you will have no more undercharging issues!!!
