Hello folks sorry to resurrect an old thread but I have a similar problem .
iPhone 5 latest iOS 7.0.3 16gb
Previous firmwares iOS 5 and 6
Carrier T-Mobile UK
Number ported over from O2 UK
I can SMS , call , MMS , email or anything else on the phone as normal to any carrier within the UK as you would expect . Here is the problem . I got a friends number back in December last year who is on the O2 UK network . I cannot SMS TO or call TO this number but this number can ONLY SMS me .We cannot call each other . All other numbers on all other carriers are fine even numbers on the same carrier as this errant / rogue number . My friend has no problem calling or SMSing anyone else just me .
It has done this on all firmwares even upto current .
I have reinstalled firmware with no joy (from a completely blank phone . Full wipe and fresh firmware download) with no backup reinstallation.
I have done the Service centre reset .
I have tried with Wi-Fi and blutooth on and off in various combinations .
I have checked my country location settings.
I have checked "my number" is correct both with and without the international code .
I have checked the recipients number with international code and without .
I have tried with iMessage on and off .
I have tried with international calling on and off .
I have deleted all contacts and tried just the friends contact as the only one in the phone .
I reinput the details of the contact from scratch.
I have NOT swapped out the sim as yet as all other contacts and services to and from them are fine just this ONE number .
T-Mobile UK are clueless .
Any help or suggestions would be GREATLY appreciated .
Thanks in advance
Fattrucker1969