Five ways you can save money on your Apple upgrade Haggle for a better deal Begin by calling your network to discuss adjusting the deal you're on, after which you can start looking at switching to another provider to take advantage of the competitive mobile deals currently on offer, said Mr Doku. The good news is that it's incredibly straightforward to switch to a new network whilst keeping your existing phone number. Bear in mind that if you have been with a network for more than three months, some providers will let you downgrade to a lower monthly tariff, providing you are not using your full call and text allowance. The same is true if you regularly exceed your bundle's allowance of free minutes and texts and incur extra charges. Phone your provider's customer services department for a tariff check-up every three months, where they will review your bills and may be able to recommend something cheaper. Sign up for cashback Cashback websites often list mobile phone providers that pay commission when shoppers click on their links. In turn, the cashback website passes on the commission to the consumer. Some retailers pay a fixed sum, while others pay a percentage of your spend - but the earning potential from these sites can be substantial. For instance on the biggest website, quidco.com, you can earn £150 from Vodafone when you sign up for a 24-month iPhone 4S contract or £96.88 for the One Plan from Three Mobile. Just ensure you visit the provider's website via quidco.com to make sure your transaction is tracked. Membership costs about £5 a year - although you will not be charged if you do not earn any cashback. Find the best deal If you are looking for an upgrade to an iPhone 4S, according to price comparison website uSwitch.com, the cheapest deal comes from Vodafone and costs £31 a month for a two-year contract. This deal includes 300 minutes, unlimited texts, 500MB of data and a free 16GB handset. For those who require more than 300 minutes, O2 offers a two-year deal that costs £36 a month and includes unlimited minutes and texts; 1GB of data and includes a free handset. While Three Mobile's two-year deal charges £34 a month, comes with 2,000 minutes, 5,000 texts and unlimited data. However with this deal you must pay £49 toward the iPhone 4S 16GB handset. Get paid for your old handset Another way to cut costs when your contract ends and you get a new handset is to trade in your old phone. To check your earnings potential, visit sites such as O2recycle.co.uk, Mazumamobile.com or Mopay.co.uk. For instance, this week at O2recycle.com you can sell your working Apple iPhone 4 (16GB) for £200, while even a non-working handset will earn you £50. Type in the 15-digit IMEI number found on the back of the handset, send off the phone, and its value will be paid to you by BACS or cheque. Although the cost of phones changes regularly, most sites have a price promise, which means they will hold the one you see on screen for up to 14 days.