... This Mobile Support 900/1800/1900 mhz , Worldwide support Mobile Phone.(Note: In north america, Some service provider only suppot 850mhz ... , Voice recorder, WAP, Handwritten input, Bluetooth, GPRS download, MMS, Smart phone, Memory extend, E-book, Coming call firewall, E-dictionary , E ... service provider for a new card exchange. 3. No signal or Weak signal. (I) If you are very high building or basement ...