Hey, does anyone know how i can update, change or add a message center number to my phone? When i try to change it i get an error saying, "value read from sim card". I need to change it from +44... to an Irish message center number, +353....

help much appreciated!

You do it in the Messaging app (Options > Settings). However, your phone could be restricted by the network operator (if the phone is an operator-customized model) not to let you change it.