Two established names, different strengths
KnowRoaming and WorldSIM are both long-standing travel connectivity providers, but they are built around genuinely different use cases and priorities. Neither is simply "better" in every scenario — the right choice depends heavily on what you actually need from your specific trip, and understanding the real differences between them will save you from picking the wrong one for your situation.
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 connectivity. 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 genuinely the stronger fit for your trip.
WorldSIM also offers both eSIM and physical SIM options, which matters significantly if your phone is older or eSIM-incompatible — see our eSIM compatibility guide if you're unsure which category your device falls into. This flexibility is a genuine advantage WorldSIM has over eSIM-only competitors.
WorldSIM has been operating since 2007, giving it one of the longest track records of any UK travel SIM provider, which counts for something when you're trusting a company with your connectivity on an important trip.
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 the whole decision. 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 genuinely easy to reason about and set up.
KnowRoaming has been providing roaming solutions since 2013, and while eSIM-only limits its flexibility compared to WorldSIM's dual offering, its focused approach means the setup process tends to be very quick — often just scanning a QR code and picking a data bundle, with no additional configuration around number retention or call forwarding to think about.
Coverage comparison
Both providers cover 200+ destinations worldwide, so for the vast majority of travellers, raw geographic coverage is not the deciding factor between them. The decision genuinely comes down to which additional features — UK number retention versus simpler destination-only bundles — matter more for your specific trip and how you plan to use your phone while away.
Setup and activation
Both activate via QR code eSIM installation, typically taking just a few minutes once you have WiFi access. Neither requires a physical shop visit or waiting for postal delivery if you're using the eSIM option, meaning you can genuinely set either up the night before you fly, or even at the airport if you've left it late.
WorldSIM's physical SIM option, if you choose it, does require postal delivery ahead of your trip, so factor in a few extra days if you know in advance that your phone doesn't support eSIM.
Pricing considerations
Pricing structures differ enough between the two that direct comparison isn't always straightforward — KnowRoaming's per-destination bundles can work out cheaper for a single-country trip with modest data needs, while WorldSIM's plans, which bundle in UK number retention, often represent better overall value if that number retention is something you'd otherwise pay extra for separately.
Always check current live pricing for your specific destination and data needs on GadgetRank before deciding, since promotional pricing and bundle structures can shift.
Our take
If you are travelling for business and need to stay reachable on your usual number throughout your trip, WorldSIM's structure is genuinely built for that specific need. If you are travelling for leisure and mainly need reliable data for maps, messaging and social media without worrying about your UK number, KnowRoaming's simpler destination-based plans are easy to pick and go with minimal setup friction.
Not sure your phone supports eSIM?
Both providers require eSIM compatibility for their eSIM options (unless you choose WorldSIM's physical SIM alternative). 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 individual option.
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