What is a data only SIM?
A data only SIM is used in devices such as tablets or routers and contains only data allowances. It is therefore not possible to make calls or send texts if you have a data only SIM.
A data only SIM provides mobile broadband connectivity, but does not include a mobile hotspot or router. It is therefore a good idea to get a data only SIM card if you want mobile broadband but already have your own device for the SIM card.
How to choose the right data only SIM
Check network coverage where you live
Since data only SIMs use the mobile network, it’s important that your chosen provider offers good network coverage where you live (or where you intend to use the broadband). On many of the providers’ websites, there is a coverage checker where you can enter your location or Eircode to see the quality of the signal in your area.
Find out how much data you need
There are many different data allowances to choose from for your data only SIM, ranging from a few gigabytes to unlimited data. How much data you need depends on how you plan to use the mobile broadband.
If you plan to use your data only SIM frequently, perhaps even as a replacement for fixed broadband at home, you will need a higher data allowance or unlimited data. But if you plan to use the broadband only occasionally, a lower data allowance might be more suitable. If your data usage is going to be very low, perhaps a prepay deal might be better value.
Choose your contract length
In some cases, you have the option to commit to a contract for 12 or 24 months. You are often offered a lower monthly cost when you choose a longer contract, at least when comparing prices with the same provider.
However, you can find great value data only SIMs on a 30-day rolling Bill Pay contract. If you value flexibility, we recommend choosing a plan with no long-term commitment. But if you know that you will be using the SIM for an extended period, signing up for a longer contract could save you money.
Compare prices
If you have followed the steps above, you should now have several different options that meet your criteria. In the table at the top of the page, you can filter which data only SIMs are displayed based on provider, data allowance, and contract length. Now you can easily compare the prices between the different options and choose the cheapest and best data only SIM for you.
Which data only SIM is the cheapest?
Eir 100 GB is the cheapest data only SIM plan right now (checked on 29/09/2026). The cost is €19.99/month when you sign a 6-month contract.
Frequently asked questions about data only SIM
No, a data only SIM card is exactly what it says – designed for internet access only. You won’t be able to make traditional mobile calls or send a standard text. However, since you have a data connection, you can still use services like WhatsApp, FaceTime, or Viber to message and call people without any hassle.
Yes, your card will actually have a mobile number assigned to it, but don’t let that fool you. In most cases, this number is only for account identification and topping up a prepaid package. You won’t be able to receive incoming calls or send a text using that number.
Yes, most major providers offer unlimited data plans, but you need to mind the fair usage policy (FUP). In Ireland, “unlimited” usually means a cap of 1 TB (1,000 GB) per month. If you’re using the SIM in a 5G router for the whole house, that’s plenty, but it’s worth checking the terms and conditions to avoid any speed throttling.
It depends on how much flexibility you need. A prepaid package is great because there’s no contract and you’re not tied down – handy for tablets or holiday homes. However, if you want the best 5G speeds and a cheaper monthly rate, a 12-month contract (bill pay) usually offers better value and more reliable mobile connectivity.
You can physically pop the card into your mobile phone, and the internet will work perfectly. But remember, your phone will effectively become a tablet; you’ll lose your mobile number for calls and texts. Most people find it’s better to use these SIMs in iPads, tablets, or “dongles” rather than their primary handset..
You can, but you need to watch the “Roam Like At Home” limits. Even if you have an unlimited data contract at home in Ireland, providers usually set a specific roaming cap (often between 20 GB and 50 GB). If you go over that while abroad in the EU, you’ll be charged extra or your speeds will be throttled.
