T-Mobile MDA Review Like so many other PDA/phones, the T-Mobile MDA doesn't look good when compared with the easy-to-use Palm Treo 650 and the powerful Sprint PPC-6700. The Treo is a better phone that gives an unmatched one-handed experience, though it lacks Wi-Fi. The PPC-6700, meanwhile, blends Wi-Fi with high-speed, wide-area EV-DO for an unparalleled one-two punch of Internet power. The MDA isn't a bad PDA/phone, it just isn't the best.