My Phone Not recognised in the net work !

[skssha]

Hi !,

I have got one HTC touch diamond of Sprint thro' my friend from USA.I am in India.I managed to activate the same in India. During first activation some error happened. In the mean time I have flashed some new rom.But now my phone is not recognised in the net work.It' telling no service.I have already programmed to Relince net work, and showing net work initially, bur now it's not catching tower. Can any body help me to come out of this problem.

Thanks in advance.

Sivashankkar