A week in Spain and three months in Spain are not the same question scaled up. The habits change, and so does the arithmetic.
Wintering somewhere warmer has stopped being a retirement activity. A large number of people now spend the darkest British months working from the Spanish coast, and the connectivity question they face is genuinely different from the one a holidaymaker faces.
On holiday, your phone is a tool for finding dinner. On a long stay, it is infrastructure.
What changes over three months
Three things, and together they matter more than the length of stay itself.
Your accommodation Wi-Fi becomes the main connection. For a week you barely notice it. Over three months, if it is poor, you will end up doing serious work on mobile data — and that is the scenario that consumes.
Video calls appear. A holiday has almost none. A working stay has several a week, and they are among the heaviest ordinary things a phone does.
You stop being a tourist. Less navigation, less looking things up, more of the routine online life you would have had at home.
So is 100GB enough
For most people, comfortably. If your apartment Wi-Fi is reliable and you use the mobile plan for the gaps — travel days, cafés, the beach, the week the router misbehaves — three months sits well inside it.
It is not enough if the mobile plan is your primary connection for working. Video calls, cloud file sync and tethering a laptop for a full working day are a different order of consumption, and someone doing all three from an apartment with no usable Wi-Fi should be looking at the top of the ladder rather than the middle.
The honest test is not how long you are staying. It is whether you have a Wi-Fi connection you trust.
THE QUESTION TO ASK YOUR LANDLORD
Not "is there Wi-Fi", which is always yes. Ask what the connection is and whether it is shared with other apartments.
A shared connection in a building full of other people doing the same thing in the same months is the single most common reason a long-stay data plan empties faster than expected.
Why one long plan beats three monthly ones
This is the part where the arithmetic is genuinely counter-intuitive, and it is worth being direct about it because it is the reason this article exists.
Buying a month at a time feels flexible and prudent. It is also, almost always, more expensive per gigabyte than buying the period in one go, because a longer plan spreads the fixed part of the cost across more data. Three separate monthly plans for a three-month stay typically cost noticeably more than one plan covering the same window.
There is also a practical cost. Each renewal is a thing you have to remember, in a month when you are busy, and forgetting it means being offline at an inconvenient moment.
Our long-stay Spain plans run to 100GB over 90 days, starting at $43.90. Compare the per-gigabyte cost against a monthly plan on the same page and the gap is visible without any help from us.
Setting up for a long stay
Set the plan up at home before you fly, as with any trip. For a long stay there is one extra thing worth doing: check what happens as the plan approaches its end, so you are not discovering the renewal process on the day it matters.
Your UK number stays on the phone throughout. For three months away that matters more than it does for a week — banks, appointments and verification codes all still arrive where they always did.
