My neighbour is currently with Worldnet for his ADSL and Telecom for his phoneline, however has his old Telstra phone number starting with 9xx-xxxx (in Christchurch).

He wants to move away from Worldnet to another unlimited plan, I suggested Slingshot as it seems to rate fairly well (as far as unlimited plans go).

He said he had spoken to them previously and that because he had a Telstra number, he wouldn't be able to get his ADSL with them, despite his phone line being with Telecom.

I thought this sounded odd and perhaps there was a miscommunication somewhere, can anyone confirm if this is the case at all, or if he should be able to switch his ADSL to Slingshot without issue?

Thanks