When your mobile bill goes up again, it’s easy to feel stuck. But you’re not. Switching to a cheaper deal is quick, free, and you can keep your number too.

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Here’s how to move networks safely and save money in the process.
1. Get your PAC or STAC code
- Text one of these to 65075 for free
- PAC if you want to keep your number
- STAC if you want a new number
You’ll get a reply within a minute with your code and any early exit fees. The code lasts for 30 days, so you’ve got time to look around.
2. Check if you’re still in contract
If your text says there’s a charge to leave, it means your contract hasn’t ended yet. You can still plan your move and set a reminder to switch when it’s finished. If you’re out of contract, you can switch straight away and start saving. Many people cut £10 to £20 a month from their bill by doing this.
3. Find your new deal
Here are some popular low-cost options to start with
- SMARTY runs on the Three network with one-month rolling plans and no credit checks
- Lebara uses Vodafone’s network and often has good deals for low data users
- Giffgaff uses the O2 network and lets you change your plan every month
- iD Mobile, VOXI, Tesco Mobile and Asda Mobile are also worth checking
Most deals include unlimited calls and texts, so focus on the data you need.
4. Apply your PAC code
Once you’ve chosen your new provider, sign up and give them your PAC code. They’ll move your number for you within one working day. You’ll get a text to say when the switch will happen. Your old SIM will stop working, and your new one will take over.
5. Watch out for hidden traps
Before you move, check these first
- Early exit fees if you’re still in contract
- If your phone is part of a bundle, you’ll need to keep paying for the handset
- Some networks run credit checks for longer contracts, so if that’s a problem, stick to rolling monthly deals
6. Cancel your old direct debit
Once your number has moved and your final bill is paid, cancel your old direct debit so you’re not paying for two services.
Quick tip
If you’re switching because of the O2 price rise, text PAC to 65075 and get your code today. Then shop around for the best SIM deals and make the move.
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Lesley says
How do I find the PAC code to switch phone provider?