QUOTE(digilife @ Oct 16 2012, 07:29 AM)
Welcome to U
Your MNP was the fastest in recent weeks
To roam in Brunei, is considered International Roaming.
If you or anyone one who intends to use Umobile for International Roaming, except Singapore, i am afraid either you choose U Postpaid (Deposit Required ) or try other telcos.
Umobile Prepaid cannot Roam on other countries.
Regarding your case, i would advice you to re-MNP to XOX.
I am sorry that Umobile have caused you some inconvenience when you were in Brunei. If you have asked me abt Brunei, i would have told you not to MNP to Umobile.
This also happened to one user which went to Australia ( to further studies ) after MNP. Anyway,
I helped him to re MNP to DiGi and even posted him his simcard (DiGi) to him in Australia too. 
Thanks for your reply.
It is quite annoying to re-MNP to other telec again and I need to backup my contact book inside the SIM Card. And it need to charge the postekpress cost if u send me the SIM card. Unless you help me paid off the postage cost la~
I have been make a research for XOX before, it roam with celcom 2G and 3G, right? But the call rate quite cheaper a bit than DiGI, Maxis and Celcom

, but still cannot fight back the call rate with U mobile.
But are you sure it can roam other country except Brunei? The XOX website does not show the International Roaming call/sms rate. The XOX network coverage good in Peninsular Malaysia (Kuala Lumpur, Selangor and so on) or not? I found most people don't even know the XOX telec in Peninsular Malaysia there..
Suggestions:
I wish I can MNP to GOOD telec coverage include roam other country as well as BEST CHEAPEST Call/SMS and Mobile Internet rate (Planning to get smartphone on future time
) in Malaysia. And also I want the LONGEST active validity period without keep me top-up and top-up every time as I not very "hebat" to used up my credit balance. Did you any idea or suggestion mnp to which telec?
Hope can U Mobile company launch the International Roaming for prepaid user. I look too high for this telec just now, very disappointed~