My overdrive works terrible-infact the battery keeps falling out of the back case. I now have now lost my battery and case back at the airport rushing to a gate. Sprint does not offer a replacement battery so now $300 down the drain! -THEY HAVE NO PARTS FOR THIS MODEL. I WOULD NEVER buy this again. In fact I am switching to AT&T because the CUSTOMER service is much better- I will tether to my IPOHNE for $45 per month . GOOD BYE Sprint! - HOPE YOUR HAPPY! - PATRICIA & her Account Supervisor HEATHER in HOUSTON- RUDE RUDE RUDE! - Could care less.