let me story abit lol...well i was rebooting my phone this morning but ended up it stuck and frozen in half way. i restarted again my phone and then no more data and signal till now. was have no problems for me to have signal and mobile data before. this is my 1st time to facing this issues tho :'(
OK, so this is sounding like a problem with the phone itself rather than a network problem. You may have to do a hard reset of your phone if it really has crashed.
If that is the case then you can find instructions here:
You should be aware that performing a hard reset will wipe all your contacts, messages etc so it might be considered a last resort.