Two established names, different strengths
KnowRoaming and WorldSIM are both long-standing travel connectivity providers, but they are built around slightly different use cases. Neither is simply "better" — the right choice depends on what you actually need from your trip.
WorldSIM — best if you want a UK number to stay active
WorldSIM's core offering has always centred on keeping a UK (and often USA) number active while you travel, alongside data. If you need people to be able to reach you on your normal number while abroad, or you want incoming calls to remain free in the 100+ countries WorldSIM supports this in, this is the stronger fit. WorldSIM also offers both eSIM and physical SIM options, which matters if your phone is older or eSIM-incompatible.
KnowRoaming — best for pure data, country-specific plans
KnowRoaming's plans are built around per-destination and per-region data bundles — you pick your destination, pick a data allowance and duration, and that is essentially it. If you do not need a UK number to stay active and just want the most straightforward data connection for a specific trip, KnowRoaming's simpler, destination-focused structure is easy to reason about.
Coverage
Both providers cover 200+ destinations worldwide, so for the vast majority of travellers, coverage is not the deciding factor between them — it comes down to which additional features (UK number vs simpler destination-only bundles) matter more for your specific trip.
Setup
Both activate via QR code eSIM installation, typically in a few minutes. Neither requires a physical shop visit or waiting for delivery, assuming your phone supports eSIM.
Not sure your phone supports eSIM?
Both providers require eSIM compatibility (unless you choose WorldSIM's physical SIM option). Check our eSIM compatibility guide first if you are unsure. Travelling as a family? WiFi Hire vs eSIM may work out better value than either option.
Our take
If you are travelling for business and need to stay reachable on your usual number, WorldSIM's structure is built for that. If you are travelling for leisure and mainly need reliable data for maps, messaging and social media, KnowRoaming's simpler destination-based plans are easy to pick and go.
Compare both providers directly →