How do prepay data only SIMs work?
Pay as you go data only sims work just like a standard pay as you go plan for your mobile, except they only include data and no call minutes or texts. Because of this, they are mostly used for mobile broadband.
Simply pick a provider that suits your needs, order your prepay data only SIM, and wait for it to arrive in the post. Once you have it, pop it into your device. To get online, you just need to top up the SIM card with one of the provider’s price plans. A prepay data only SIM never ties you into a contract, meaning you can stop the service or switch networks pretty much whenever you like.
What is the difference between a prepay data only SIM and a bill pay data plan?
The main difference between a prepay data only SIM and a bill pay plan (often called a contract plan) is that pay as you go isn’t tied to a specific provider for a fixed amount of time. Today, there are some bill pay data plans with rolling contracts, but most still require a commitment, unlike pay as you go options. What’s more, even if a bill pay plan doesn’t have a long contract, you almost always have to give a notice period before leaving.
Because of this, it’s easier to switch between different data allowances, and also between different providers, when you have a prepay data only SIM. The advantage of bill pay plans is that they usually offer larger data allowances or “unlimited” data options to choose from.
When is a prepay data only SIM better than a bill pay plan?
Which option suits you best mainly depends on how you plan to use your mobile broadband and how much data you actually need. A prepay data only SIM is a more flexible option that is perfect for people who need internet access but don’t intend to use it all the time. It is also a solid choice if you aren’t a heavy data user.
If you plan to use your mobile internet every day and know that your data usage is going to be high, a bill pay contract is likely to be better value for money. This also applies if you are going to share the connection with multiple users or devices.
How to choose the best prepay data only SIM
- Choose a provider with good network coverage in your area. For your data sim to work well, it is essential that the provider has a strong signal where you are. Many providers have coverage maps on their websites, so be sure to check the 4G or 5G coverage in your local area (or wherever you plan to use it) before ordering.
- Explore the range of data allowances. The amount of data you get varies between providers. If your usage changes from month to month, or if you prefer having the flexibility to choose, look for a provider with a wide selection of data caps.
- Check how long the credit lasts. It’s worth checking the terms regarding validity. Most prepay data only SIMs need to be topped up or used at least once every six to twelve months to keep the SIM active. The data bundles themselves usually last for 28 or 30 days, though some providers offer longer-term options.
- Compare the prices. The amount of data is the main thing that dictates the cost, but prices do vary between networks. Take the time to compare offers to save yourself some money. We recommend comparing prices after you have shortlisted a few options that meet your needs.
Where can I buy a prepay data only SIM?
In most cases, you can order the SIM card online, directly from the provider’s website. If the provider sells SIM cards through retailers (like convenience stores or supermarkets), you can usually pick one up there as well.
Which is the cheapest prepay data only SIM?
Lyca Mobile XS is the cheapest prepay data only SIM right now (checked on 19/09/2026). Top up from €4.99.
Do I need a router for a prepay data only SIM?
You might need to buy a router (sometimes called a portable WiFi device or MiFi) for your prepay data only SIM for two reasons: if you want to share the connection with other people or multiple gadgets, or if your device doesn’t have a SIM card slot.
If you are the only one using the data on a device that already has a SIM slot (like a tablet or a laptop with 4G/5G built-in), you do not need a router.
Is a dongle needed for a prepay data only SIM?
If your device, such as a laptop or PC, lacks a SIM card slot, you will need a dongle (USB modem). You simply place the SIM card into the dongle and plug it into the computer’s USB port.
A dongle might also be necessary if you are using certain types of routers that don’t have a built-in modem. In that case, you put the SIM in the dongle and connect the dongle to the router.
Can you use prepay data only SIMs abroad?
Some prepay data only SIMs work abroad. Most are limited to use within the EU/EEA (under “Roam Like at Home” rules), but there are also plans that work in other countries. Always check the roaming terms and conditions on your provider’s website to be sure, or contact their customer care to find out about any restrictions before you travel.
