Samsung Galaxy Ace GT-S5830i- Mobile Network not availble

[rahulcanada]

Hi all,
I have legal & unlock Samsung Galaxy Ace GT-S5830i handset.
I stay in Canada & tried to use new Virgin Mobile sim and fails..it show full network but when I make call- Mobile Network not available.

Then I took my handset to them & they found that my handset (or IMEI) is somehow not compatible with Virgin Mobile Sim.

For some good reason I want to use Virgin Mobile Sim hence please suggest what are the my options.(& Of course I dont want to buy another handset)

I tried following options too-
1. Factory Resetting of Samsung Galaxy Ace GT-S5830i handset.
2. tried my handset with other mobile sim..it works.
3. tried same virgin mobile sim in other handset..it works


I heard about flashing handset..Will that help me to run Virgin mobile sim.

Thanks for your time.