
Smartphone enthusiasts are keenly waiting for the chance to get their hands on Apple's new iPhone 5. Its launch invites the perennial question of what to do with your old smartphone, which cost so much a year or so ago and was once a must-have item. Is it now a relic?

The provider will typically give you a credit for the phone, which will then be offset against the cost of your new handset and mobile contract.
SmarTone will give you HK$2,450 of credit for a 16 gigabyte iPhone 4, and HK$3,720 for a Samsung Galaxy S3.
If you take this route, it is worth shopping around, as the trade-in value varies.
If you sign up for a service plan, PCCW will exchange a 16GB iPhone 4 for a credit of HK$2,400, but One2Free offers HK$2,750 for the same iPhone 4 and HK$3,700 for a Samsung Galaxy.
If your old phone is in good condition, you can get better value (and cash upfront) selling to a shop that specialises in used handsets.