The simcard is missing or invalid simcard

[letuvu]

This is my serious problem.

[xanth]

At the risk of sounding insulting, I think we might need some more information.

What changed on your phone so that it stopped working?

Have you tried your sim card in another phone to see if it works there and isn't actually damaged?

[Darthbelmont]

This is my serious problem.

Just re-instal the rom

[grayme]

Just re-instal the rom

How does that sort a potentially duff sim?

[letuvu]

I've tried many kind of simcards and uped so many roms, but nothing gona change

[rud1]

it's also happened to me once, i did hard reset and installed a new rom

[gopi51]

I also had same problem once and I had to take it into the service centre who changed the complete board due to faulty SIM card reader pins. The phone was still under warranty and got this replaced for free.

Cheers