pls help guys..give me some advice on how to deal with this..I just bought this one from a fellow istoryan, but when i am using it na, i cant get signal man sa akong smart nga sim..Sometimes naa signal, sometimes wala..Ako gi try insert lain nga sim, (sun) naa man signal..And kung smart na pod ako gamiton, mukalit lang naa signal nya mawala ra pod..sige lang sending failed...What shud i do man?pls pm lang..thanks..