Do you know any situation where iPhone might misinterpret a national phone number as an international one?

We have a business phone supplier who provide our office numbers.

Sometimes, when making an outbound call from an 0330 number (UK number) provided by this company (e.g. 0330 XXX XXXX) it shows up on iPhone as: +33 (0) 088XXX - with the last four characters truncated, and formatted as if it were a French number.

This is a bit hit and miss and doesn't seem to happen every time.

I wanted to validate that the supplier's explanation is correct:

In regards to the incorrect CLI presentation on iPhones, I believe that this is an Apple issue as I have seen several threads about the same thing on the iOS developer forums. It looks like Apple made changes to the error handling between their cell transmitter/receiver unit and iOS which, in certain circumstances (mainly errors within the iPhone software although bad information from the cell provider can also be to blame), misinterprets some numbers as international numbers. In the case of the 033~ numbers it thinks they are French and will display the number in what it thinks is the correct manner. By the looks of things, this is the second time Apple have managed to do this so I'm expecting that they will have it fixed for the next iOS release (8.1.3 if I remember correctly).

I've done some pretty extensive searching of bug reports and developer forums and can't find anything mentioned about this issue having happened in the past, nor being due to be fixed. Has anyone else heard of this happening or know where I might find out more about the issue?