How to switch SIM provider UK 2026 — complete guide
Switching your UK mobile SIM is free, straightforward and takes less than one working day. Here is the complete step-by-step guide.
Step 1 — Get a PAC code to keep your number
Text PAC to 65075 from your current phone. Receive a free reply within 60 seconds with your PAC code — nine characters (format: ABC123456). Valid for 30 days. Skip this step if you are happy with a new number.
Step 2 — Choose your new plan
Compare plans on GadgetRank. Key criteria: network coverage at your home, workplace and usual locations; data allowance vs your actual usage; EU roaming if you travel to Europe; 30-day rolling vs 12-month contract.
Step 3 — Sign up with your new provider
Sign up online. Provide your PAC code and existing number when prompted. New SIM arrives by post in 1-3 days, or activates instantly if eSIM.
Step 4 — Wait for the transfer
Your number transfers within one working day of the new network processing the PAC code. Your old SIM stays active until the exact moment the switch completes — you will not miss any calls or texts during the transfer.
Step 5 — Activate your new SIM
Insert the physical SIM or scan the eSIM QR code. Your number is live on the new network. Your old contract cancels automatically — no need to call your old provider separately.
Common questions
Can I switch mid-contract? Yes, but you may owe an Early Termination Charge — the remaining months at your monthly rate. Check your contract before requesting a PAC code. On 30-day rolling plans, no charges apply.
What if my PAC code expires? Text PAC to 65075 again — a new code is issued free and instantly. The old code is invalidated.
How long does the whole process take? From PAC request to live on new network: 2-4 days with a physical SIM. Same day with eSIM if the new provider supports it.
What about my old direct debit? Your old contract cancels automatically when the port completes. You will receive a final bill. Cancel the direct debit only after the final bill is paid.
According to Ofcom's switching guidance, providers cannot charge for a PAC code and must complete a valid switch request within one working day.
Compare SIM plans to switch to on GadgetRank →
Switching to a budget network — what to expect
The signal quality from a budget MVNO on EE is identical to EE direct — the same physical masts, the same 4G and 5G, the same geographic coverage. What changes is the price (significantly lower) and the customer service channel (typically online/email rather than in-store).
For the first week after switching, monitor your signal in the locations you use most. If coverage is as good as or better than expected (it should be identical on EE), there is no reason to return to a major network. Most people who switch to a budget MVNO stay switched — the signal is the same, the cost is lower.
Compare SIM plans to switch to on GadgetRank →
Why compare on GadgetRank?
GadgetRank is an independent UK comparison site — not affiliated with any retailer, recycler or network. Every comparison is based on live price data. There are no paid placements or sponsored rankings. The best current offer appears at the top because it is the best current offer, not because of any commercial arrangement.
All retailers listed on GadgetRank meet minimum quality criteria: Trustpilot score of 4.0 or above, minimum 12-month warranty, battery health guarantee, and devices unlocked to all networks. This baseline means every option on GadgetRank is a trustworthy choice — the comparison is purely about price and any additional perks.