Roaming is where a mobile plan quietly stops being the plan you bought. You cross a border, the phone keeps working, and the question of what that is costing only resolves itself weeks later. The alternative is a plan where the roaming allowance is printed on the same card as the data — so you know the number before you travel, not after. On a SIM with roaming included that figure is part of the tier rather than a bolt-on bought in a hurry at the airport.
This is the part worth understanding before choosing. Roaming is not a flat benefit applied equally across the range; the cap rises as you move up, and the destinations widen too.
| Plan | Data | Roaming included | Price |
|---|---|---|---|
| UK Plan Smart | 5GB | EU, capped at 5GB | Lists £5.00, now £3.50 |
| National Plus | 30GB | EU | Lists £10.00, now £5.00 |
| UK Plan Super Extra | 75GB | EU and India, capped at 12GB | Lists £15.00, now £7.50 |
| UK Plan Mega Plus | 120GB | EU and India, capped at 12GB | Lists £20.00, now £10.00 |
| UK Plan Unlimited | Unlimited | EU and India, capped at 35GB | Lists £25.00, now £12.50 |
Each discount applies to the first month; the standard price is what the line runs at afterwards.
Most UK plans treat Europe as the roaming story and everywhere else as a separate conversation. Naming India in the same allowance is uncommon, and for a large number of households in Britain it is the destination that actually matters — the one with family at the other end, visited for weeks rather than days. From the 75GB tier upward it sits inside the plan on the same terms as a trip to Spain.
That changes what the right tier looks like. If your travel is a fortnight in the EU once a year, the 5GB roaming cap on the entry plan is probably enough. If it is a month in India, 12GB is a different proposition, and the 35GB on the unlimited tier is a different one again. Work backwards from the longest trip you expect to take in the year rather than from an average month, because that is the trip the allowance has to survive.
One distinction saves confusion later. Roaming covers using the phone while you are abroad. Calling a number abroad from the UK is a different thing, and every tier includes 100 international minutes for exactly that. The two allowances do not draw on each other, so a month that involves both a trip and a lot of calls home uses each separately. Anyone choosing a SIM only deal mainly for overseas family should check both lines on the plan card, not just the one.
Roaming data goes faster than home data, for an unglamorous reason: you use maps constantly, you upload more photos, and you are not on a familiar wi-fi network in the evenings. A fortnight away commonly runs through two or three times what the same fortnight would at home, which catches out anyone sizing a travel SIM plan on their normal month.
A rough way to size it: take your normal weekly usage, double it, and multiply by the number of weeks away. If that lands near or over the cap on the tier you were considering, the tier above is the better buy for that month — and because the plans run in thirty-day blocks, you can move up for the trip and back down afterwards without penalty.
Pick the tier on where you go, not only on what you stream. For occasional EU trips the lower tiers cover it; for longer stays, and for India in particular, the 12GB and 35GB caps higher up the range are the reason to climb. Either way the figure is visible before you buy, which is the main thing a roaming data plan should give you.
The roaming allowance on every tier, along with the EU roaming policy itself, is published by Lycamobile.
Before the next trip, it is worth a browse through OrganizeTrip.
