According to a survey conducted by UBS, Apple’s iPhone has an 89 per cent retention rate, the highest retention rate among its rival smartphones, and more than double than its nearest rival HTC, who’s retention rate is 39 per cent.  Only six per cent of respondents, who are current subscribers, said they intended to move to a different operating system, while four per cent said they were undecided, suggesting that the retention rate could even reach 93 per cent.