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SIM-only deals and mobile promo codes UK 2026

SIM-only deals, promo codes and referral offers from UK mobile networks — unlimited data from £3.75 with Chattr code HONEST75, half-price first months and gift cards.

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The cheapest unlimited data SIM on HonestCodes right now is Chattr's Freedom One: £3.75 for the first month with the HonestCodes-exclusive code HONEST75, then £15 a month, falling to £13 from month 12, with no contract and no credit check. Enter the code at checkout after opening our Chattr link. Every network on this page, from Lebara and Lyca Mobile to 1pMobile and VOXI, has been read against its own published prices and terms, with the date of the last check shown on each page. Coupon sites list mobile codes with no date and no test; HonestCodes gives the working code, the full link and the date it was last checked. Want a new phone as well? Fonehouse takes £30 off the upfront cost of any phone or SIM deal with 30OFFHCD, exclusive to HonestCodes (subject to credit check).

17 verified UK mobile referral codes

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Common questions about mobile referral codes

What is the cheapest unlimited data SIM in the UK?

Chattr's Freedom One: £3.75 for the first month with code HONEST75, exclusive to HonestCodes, then £15 a month falling to £13 from month 12. Unlimited 5G data, calls and texts, no contract, no credit check.

Is there a Chattr promo code?

Yes: HONEST75. It takes 75% off the first month on Chattr's Freedom One. Open our Chattr link and enter it at checkout.

Do SIM-only deals need a credit check?

Not on the 30-day plans listed here. Chattr, Lebara, Lyca Mobile and 1pMobile all sell rolling SIM-only plans without a credit check.

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