Hello

A friend of mine was telling me an interesting issue with his wife's mobile number. 

His wife originally had 027 number. This was ported to VF a few years ago and no issues there. She has since now ported her 027 from VF to 2Degrees and for the last year they have been unable to work out how she now has 2 numbers. 

The issue is she can make or receive calls from her 027 2D number but she has somehow gotten another 022 number which is how she sends and receives texts. 

She is using an iPhone4.

How is this possible? I can't think of anything she has done on her phone to cause this, and a visit to the store did not resolve it either. This has been like this for nearly a year now, and she has actually just accepted this anomaly but I am curious to know how this is possible?