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According to research carried out by comparison site Uswitch, if you continue on a rolling plan with your phone, you could be adding £300 a year to bills on average.
If you change to a SIM-only deal, it's thought you could be cutting your bills by around £30 a month.
Pretty good going, if you ask us.
Uswitch estimated that back in February 2019 an iPhone XR with 30GB of data on a 24-month contract would have set you back around £40 a month.
This is where SIM-only providers come in.
You can get a SIM-only contract with Vodafone with 60GB of data for £8 a month, which will save you £384 a year.
Alternatively, a SIM-only contract with Smarty for 30GB of data for £10 a month. Saving you £360 a year.
If you're not an Apple user, there's also a similar comparison for the Samsung Galaxy S9. Customers would have been paying around £29 a month for 17GB of data in 2019.
Moving to 60GB with Vodafone saves you £252 a year.
Many people, my mum for example, would be asking the question 'can I keep the same number though?' Yes, yes you can.
It's actually really simple as well - thanks to rules that were introduced in 2019.
So now, people swapping providers but wanting to keep that all important number can request a Porting Authorisation Code (PAC) from your existing provider.
To get the code, you need to text 'PAC' to 65075, within a minute you'll have a response with your code which is valid for 30 days - plenty of time to shop around for the best deal.
Ru Bhikha, mobiles expert at Uswitch, told The Sun: "The end of a mobile contract signals a decision crossroads for most phone users.
"You can either upgrade to a newer model with increased functionality, or switch to a SIM-only deal and rake in a major discount.
"If you're happy with your handset when your existing deal comes to an end, check out your data usage and shop around for a SIM-only contract which offers you the appropriate package."
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