Hi Rob,

When your phone comes back in service your operator alerts those SMS centres that have messages waiting for it that delivery can now take place.

It sounds to me like this is happening, but that the sending SMS centres cannot tell that the message has been delivered to your phone.

It could be a handset fault - you'll need to try your SIM in another phone to find out.

If you confirm that the problem persists with a different handset then let us know. FYI the messages will still deliver again, but should then stop.

I'd be happy to run some tests on your number using my industry connections if you PM me your mobile number - entirely up to you of course.