Realised that my i780 (version DXHJ1) got problem with Maxis if chose band as automatic or WCDMA (3G). Signal is weak & can't make/receive calls, send/receive MMS & connect to internet. It is all ok if I select GSM.

No problem when I use the same sim card with 3G selected on my other phone (Nokia E71). Strong signal in the same area.

Did another test with using Celcom 3G on my i780 - flawless without any problems.

All tests were conducted at the same location.

My 90% conclusion cause of problem is that Samsung i780 has problem with Maxis 3G.

Anyone else can confirm this before I opt to upgrade the firmware to the latest version?