Chattr is a no credit check UK SIM on the O2 network. Flexible 30-day plans from £10/month, free EU roaming, eSIM support and no nasty surprises. Chattr SIM review

We came across Rewild through our research into ethical alternatives to the big networks. We haven't used the SIM personally, so this is an honest research-based explainer rather than a hands-on review — we'll be upfront about that throughout. Here's what we found.