Red triangle and white exclamation mark, nexus s

[Bellabits2001]

So I my carrier is Rogers...I bought my nexus s with a company called Mobitlicity..I didn't like the range of the towers so I change the carrier to Rogers for better coverage.
My issue is that when I send a text message, it doesn't send and a red triangle with a white exclamation mark shows up...I called Rogers support tech and they tried to push something through, unsuccessfully, then told me that because I didn't purchase it through them that it doesn't have the OS ( or something) of Rogers..so basically they can't help me.
If anyone at all has any idea WTH..please help me...
I really love my phone except this one issue and I just bought it about 3 months ago at full price.

 

[ijip]

could be if u bought the phone from a sprint or att carrier and switched it over to rogers somethings may not work. with smart phones there are just so many things that can glitch that you never know...

 

[igotsanevo4g]

Try taking it into a rodgers store, or ask them how you can run an Odin restore through your computer with the proper software.

 

[jamieboy88]

Google the Rodgers APN settings. Check them against the APN settings on the phone.