Hi. I suddenly can't send SMSes to 5 digit numbers. I have an iPhone 6. I used to be able to send SMSes to these numbers, but now it says "not delivered". I have not changed my contract. I called Vodacom, and they said they have never heard of that happening, and that if I can send SMSes to normal numbers, then I should also be able to send to 5 digit numbers. Anyone have this happen before? Thanks.