5800 3G problem

[lokubuwa]

guys, im nt gtn 3G signals on ma 5800 at all.. i chkd in ma n95 n i do gt 3g signals in tht.. do u thnk il hv 2 gv it 4 repair or is thr sm setting i hv 2 activate? oh btw i hv chosen dual mode in Network Mode menu.. wen i choose UMTS no signals at all..