How To Switch Mobile Provider In The UK: Step-By-Step Guide (2026)

Switching mobile provider is quick, simple and free thanks to rules set by Ofcom. Whether you want a better price, faster network speeds or improved coverage, moving to a new provider can usually be completed within one working day.

This guide explains exactly how to switch mobile provider, how to keep your existing number, and how to avoid unexpected fees.

Why Switch Mobile Provider?

Common reasons people switch include:

• Lower monthly costs
• Better network coverage
• Faster 5G speeds
• More data allowance
• Better customer service
• Contract ending and moving to SIM-only

Step-By-Step: How To Switch Mobile Provider

Step 1: Check Your Contract End Date

Check whether you are still in a minimum term contract, as switching early may incur an early termination fee.

Step 2: Compare New Deals

Compare SIM-only deals, contract phones and network coverage before choosing a new provider.

Step 3: Request A PAC Or STAC Code

If you want to keep your number, request a PAC code. If you don't need to keep your number, request a STAC code instead.

Step 4: Give The Code To Your New Provider

Provide the PAC or STAC code to your new mobile provider to complete the switch.

Step 5: Activate Your New SIM Or eSIM

Insert your new SIM card or activate your eSIM once it arrives.

Step 6: Confirm The Switch Is Complete

Your number (if transferred) and service will move to the new network, usually within one working day.

How To Get A PAC Code

1. Text "PAC" to 65075 (free from your current provider's SIM)
2. Receive your PAC code by text message within minutes
3. Give the code to your new provider

How To Get A STAC Code

1. Text "STAC" to 75075 (free from your current provider's SIM)
2. Receive your STAC code by text message
3. Use it to cancel your service without transferring a number

Will I Be Charged For Switching?

You may be charged an early termination fee if you leave before your minimum contract term ends. If your contract has already ended, switching is usually free.

Switching From Pay Monthly To SIM-Only

Many customers switch to SIM-only deals once their handset contract ends, reducing monthly costs while keeping their existing phone.

Switching Between Contract Phones

If you want a new phone as well as a new provider, you can switch directly to a new pay monthly contract with a different network.

Best Time To Switch Mobile Provider

• When your minimum contract term ends
• When better deals become available
• When your coverage or network speed is unsatisfactory
• When you want to reduce your monthly costs

Compare Mobile Deals Before You Switch In 60 Seconds

With CheckMyBills you can:

• Compare SIM-only deals
• Compare contract phones
• Compare major UK networks
• Find better coverage and pricing
• No login required
• Instant comparisons

Conclusion

Switching mobile provider is straightforward, quick and often free. By comparing deals in advance and using a PAC or STAC code, you can move to a better network without losing your number or facing unnecessary delays.

With CheckMyBills, you can compare mobile deals before you switch in around 60 seconds, with no login required.