Donating prepaid cell phone balances

We’re getting rid of our old T-Mobile prepaid cell phones soon, and I wasn’t sure what to do with the balances on them. Turns out there’s a comprehensive list of charitable organizations you can donate to via text message (if I can figure out how to send a text message with an ancient Motorola V195).

http://mobilegiving.org/?page_id=43

Greater Boston Food Bank stands out to me, since we often give to them anyway.