I'm not receiving texts messages anymore

Hello!  Yesterday, my android phone, a Motorola Atrix, stopped receiving texts messages.  I think I can send them... but since I can't receive any I cannot veryify from others whether they're receiving them or not.  I know for sure that I am not receiving any since I have Google Voice set up to send me my voicemail as transcribed texts.  When I checked Google Voice, I have received a voicemail which normally gets transcribed and sent to me, but I did not receive it.

I don't think I installed any new apps that would hijack my texts from Handsent SMS, so I don't think that's the problem.

Does anybody have any ideas for how I can fix this?  Any info you can provide me will be really appreciated!

Thanks a lot!