Help My phone is not receiving sms !!

[DeathRuler]

Hi everyone,
my cell stopped receiving sms all of a sudden...i put my sis in anoder persons phne nd it was receiving sms i put it bak nd it still wasnt receiving sms...WAT DA HELL DO I DO! :'(

 

[DeathRuler]

im on 2.1 ryt now...maybe i shud go to 2.2 ? or reet my phne? i restarted it like a million times..itw as fyn by yesterday