Piper Jaffray has added yet more weight to rumours that Apple will launch a mobile phone.

Analyst Gene Munster recommended investors buy Apple stock, and said the company was "75 per cent" likely to announce a mobile phone product soon.

"Additionally, we believe Apple will benefit from the new Intel-based Mac's, along with what we estimate to be a 75 per cent chance of a iPhone in the next 12 months," Munster said.