problems with texts not going through occasionally

[Devali]

Having problems with a 521 where texts won't send randomly. Noticed now that it only occurs when the phone puts a 1 in front of the number as in making a long distance call. How do I get it to stop doing this? TIA

 

[Devali]

Rebooting seems to fix it but it's annoying, why does it randomly put a 1 in front of numbers that are used frequently just fine?