I'm pretty sure I have a defective speaker (speaker phone). I've tried all the fixes listed on here. (updated the OS, removed battery etc) When on speaker phone it sounds like crap very tinny sounding at louder volumes. It sounds OK on low volume though. The phone was purchased off of eBay, I called T-Mob to see what my warranty options were and they could not find anything regarding my phone. Will I be able to get a replacement or will I have to pay the $100 warranty charge?