After the latest upgrade to IOS 6.1 I have not been able to recieve (yet I can send) text messages from some phone numbers. I can get IMessage and from some numbers (if they have Iphones or other smart phones it works) but if they do not have a smart phone their texts cannot come through to my phone, they receive mine but do not come through to me. I have tried turning off IMessage, changing other settings, restarting my phone, etc. Any insight? Thanks in advance!