Unable to save APN settings after update to iOS 7

I have been setting up a client's iPhone 5 and it has been updated to the latest release of iOS 7 (iOS 7.0.2) and it is no longer storing any APN settings.
I have tried installing this from a profile with correct details but each time I go back into Mobile Data settings the APN, Username and Password fields are blank.
Has anyone seen this issue before and know a fix for this?
NotoriousBNGAsked:
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Magnus BIT-supportCommented:
Hi
Have you tried reset of the APN settings? (Reset Networking Settings). The phone should handle itself after that with settings from the provider.

/MadJax
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NotoriousBNGAuthor Commented:
Hi Madjax

Thank you for your reply.
We have tried both a reset of the Network settings and a full factory reset. We think that this may be an issue with the SIM and we are contacting the operator regarding this.
I will update and close the question if this is the case.

/NotoriousBNG
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NotoriousBNGAuthor Commented:
The issue was relating to the SIM not being set by the operator.
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NotoriousBNGAuthor Commented:
Issues was vendor related.
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