Hi Marion,
thank you for your reply.
i did that. creating a new Live ID and connected it with phone. but nothing change with it.
still on same set of issue. anybody knows why this happen.
everything perfect with only wifi.
i did all the marked answers in this thread. but no result.
i can browse the web through IE using 3g. i can goto marketplace and browse the apps but cant download and also all the syncing things with accounts not happening.
why this issue comes??
this is issue about phone hardware or with OS. why still cant give a proper solution for this.