Unhappy Sms Problem :(

Sms messages come to the phone now. sometimes comes after 1-2 hours. How can I fix it? Razr XT910 ( Retail UK 4.1.2 )

Bismillahirrahmanirrahim / بِسْــــــــــــــــــمِ اﷲِالرَّحْمَنِ اارَّحِيم