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March 26, 2026 — Comments are off for this post.

Best SIM Only Deals UK 2026: Honest Mobile, Smarty and giffgaff

Last updated: March 2026

By Stiv · Design, technology and personal finance

This article contains affiliate or referral links. If you click through and sign up I may earn a commission or referral bonus at no extra cost to you. It does not affect my editorial view.

The best SIM only deals UK in 2026 are not coming from EE, Vodafone, O2, or Three. They come from the challengers running on the exact same infrastructure at a fraction of the monthly cost. Three stand out right now: Honest Mobile, Smarty, and giffgaff. Each one has a distinct edge, and together they cover pretty much every type of mobile user. Here is what sets them apart.

Published by Stiv in Buying Guides, Technology lover

Tags: 5G, eSIM, giffgaff, Honest Mobile, mobile, MVNO, SIM only deals, Smarty, UK mobile

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