Why is my iphone 5c not recognising certain numbers

recently, my iphone 5c won't let me send text messages to certain numbers. they are all international numbers, and if i try to call the number from my contacts list, it works fine, but if i try to text them, or even reply to a text they have sent me, i get the message 'the number you have sent to is incorrect. if you are sending to an international destination you need to precede the number with a +'
needless to say, the numbers already ahve the requisite +, and als, if they were incorrect, they would not work when i made a phone call- and they do. have tried it with dial assist both on and off in settings. have tried turning the phone on and off. nothing is working.
anyone know what is going on and how to fix it?
cheers

won't let me send text messages to certain numbers. they are all international numbers,
"Text messages" - do you mean SMS or iMessage?  If SMS, do you have international SMS provisioned on your carrier account?  If not, you can't send internationally.

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