Force android check for update OTA?

Your android phone is programmed to check for update every X hours, but you can force this check by doing this:

1 open your phone dialer
2 insert this number *#*#2432546#*#* this mean *#*#checkin#*#*
3 If every thing went ok, you will see an exclamation icon in your notification bar, and if you have an update pending you should be notified.