Motorola Mobility (MMI +2.7%) is up on an ugly day after announcing the XT531, a low-cost...

Motorola Mobility (MMI +2.7%) is up on an ugly day after announcing the XT531, a low-cost Android phone aimed at China and other international markets. Motorola has struggled to keep pace with Android rivals Samsung (OTC:SSNLF) and HTC (OTC:HTCCF) as of late, but China has been a bright spot for the company.