Refer to this thread
http://androidforums.com/wildfire-s...wildfire-unable-make-recieve-calls-texts.html
If that method of finding your service centre number doesnt work then use this method
# Open up your "phone" application
# type in the dialer *#*#4636#*#*
# press phone information
# scroll down to a white box which has the letters "SMSC:" next to it
# You can press
refresh to see if numbers appear in the box, if they do press
update, if they dont then find your service centre number in the internet and type it in the box and press
update