You've decided to to upgrade to the new Samsung Galaxy S9 or S9 +, but what happens now? How do you trade in your current phone, and what's the best deal to go for? has your contract run out and you want to upgrade to a better plan that suits you?

We've rounded up the best upgrade deals for the Samsung Galaxy S9 from Carphone Warehouse.

Right now Carphone Warehouse have an exclusive offer for £100 extra off when you trade in your old mobile. See more details here.

Carphone Warehouse offers a range of different deals depending on your budget. It has many price plans from a range of different networks, including EE, Vodafone and O2, ensuring you'll find the best Samsung Galaxy S9 deal when you upgrade from your old phone.

Carphone Warehouse has a price promise that if you find a cheaper deal than the one they are offering, it will not only match it, but pay your first monthly bill.

Carphone Warehouse have a variety of upgrade plans for the Samsung Galaxy S9. Some of the best ones we have found below from O2, Vodafone and EE.

  • Fastest UK network offering super fast 4G data up to 60mbps.
  • Free 6 months Apple Music for iOS and Android.
  • EE Roam Like Home allows you to use your plan anywhere in Europe.
  • Free 3 months BT Sports.
  • Free Samsung Wireless charger.

Editors pick: 15GB data, unlimited texts and unlimited minutes on a 24 month contract for only £48.00 a month with an upfront cost of £129.99. Over 2 years this plan works out to be £1,281.99. See this plan here.

Bestseller in last 24 hours: 25GB data, unlimited texts and unlimited minutes on a 24 month contract for only £53.00 a month with an upfront cost of £99.99. Over 2 years this plan works out to be £1,371.99. See this plan here.

25GB data, unlimited texts and unlimited minutes on a 24 month contract for only £63.00 a month with an upfront cost of £9.99. Over 2 years this plan works out to be £1,521.99. See this plan here.

10GB data, unlimited texts and unlimited minutes on a 24 month contract for only £43.00 a month with an upfront cost of £184.99. Over 2 years this plan works out to be £1,216.99. See this plan here.

15GB data, unlimited texts and unlimited minutes on a 24 month contract for only £53.00 a month with an upfront cost of £79.99. Over 2 years this plan works out to be £1,351.99. See this plan here.

25GB data, unlimited texts and unlimited minutes on a 24 month contract for only £58.00 a month with an upfront cost of £34.99. Over 2 years this plan works out to be £1,426.99. See this plan here.

  • O2 Priority gives you access to early tickets and discounts on food, drink and entertainment.
  • O2 Travel allows you to use your plan anywhere in the EU.
  • O2 WiFi gives you access to over 15,000 wifi hotspots across the country.
  • Free Samsung Wireless charger.

Editors pick online exclusive: 50GB data, unlimited texts and unlimited minutes on a 24 month contract for only £49.99 a month with an upfront cost of £99.99. This includes a free Samsung wireless charger. Over 2 years this plan works out to be £1,299.75. See this plan here.

Bestseller in last 24 hours: 30GB data, unlimited texts and unlimited minutes on a 24 month contract for only £56.00 a month with an upfront cost of £79.99. Over 2 years this plan works out to be £1,423.99. See this plan here.

15GB data, unlimited texts and unlimited minutes on a 24 month contract for only £48.00 a month with an upfront cost of £129.99. Over 2 years this plan works out to be £1,281.99. See this plan here.

25GB data, unlimited texts and unlimited minutes on a 24 month contract for only £54.00 a month with an upfront cost of £99.99. Over 2 years this plan works out to be £1,395.99. See this plan here.

10GB data, unlimited texts and unlimited minutes on a 24 month contract for only £40.00 a month with an upfront cost of £214.99. Over 2 years this plan works out to be £1,1174.99. See this plan here.

  • Vodafone global roaming allows you to use your plan in 110 countries, including the US.
  • Fast 4G network.
  • Free Samsung wireless charger.

Editors pick: Vodafone are offering 16GB instead of their usual 4GB with unlimited texts, unlimited minutes on a 24 month contract for only £47.00 a month with an upfront cost of £99.99. Over 2 years this plan works out to be £1,227.99. See this plan here.

Bestseller in last 24 hours: 16GB data (usually 4GB) with unlimited texts, unlimited minutes on a 24 month contract for only £51.00 a month with an upfront cost of £59.99. Over 2 years this plan works out to be £1,283.99. See this plan here.

16GB data, unlimited texts and unlimited minutes for £55.00 a month with an upfront cost of £29.99. Over 2 years this plan works out to be £1,349.99. See this plan here.

16GB data, unlimited texts and unlimited minutes for £39.00 a month with an upfront cost of £274.99. Over 2 years this plan works out to be £1,210.99. See this plan here.

60GB data, unlimited texts and unlimited minutes for £47.00 a month with an upfront cost of £269.99. Over years this plan works out to be £1,397.99. See this plan here.

32GB data, unlimited texts and unlimited minutes for £49.00 a month with an upfront cost of £139.99. Over 2 years this plan works out to be £1,315.99. See this deal here.

40GB data, unlimited texts and unlimited minutes for £49.00 a month with an upfront cost of £149.99. Over 2 years, this plan works out to be £1,325.99. See this deal here.

Below you'll find links to the four coverage checkers you need. Why four? Because any other network is an MVNO (Mobile Virtual Network Operator), which means they don't have their own masts and signal, they use the networks provided by Vodafone, EE or O2. GiffGaff and Tesco mobile, for instance, uses O2's network, while BT Mobile uses EE's.

Or, if you'd rather go independent, you can try Ofcom's mobile signal checker.