Change Message center on Iphone

Well I am currently using an iphone and i realized i couldn't reply text messages even though i could receive them.

This problem is related to your message center number.Using mutiple network chips can cause a change in your message center number and can cause you this problem.

To fix this:

1.Currently check your message center number by typing this into your keypad " *#5005*7672# " (without the quotes)

2Now change it by typing this in your keypad followed by dial "**5005*7672*SMSCENTERNUMBER# " 

So for example (**5005*7672*+2332000000007#)