Not every connection needs a phone number. A data-only SIM provides mobile data without voice or a primary number, which makes it ideal for second devices and as a backup connection.
Good uses for a data-only SIM
- Tablets and laptops with a SIM/eSIM slot.
- A pocket Wi-Fi / mobile router for travel or work sites.
- IoT devices, dashcams and security cameras.
- A cheap broadband backup that kicks in if home internet drops.
Because there is no voice element, compare data-only SIMs purely on price-per-GB, network coverage and any speed caps. Many are sold as prepaid or flexible monthly plans, so you can match the commitment to the use case.
Browse plans and filters →Frequently asked questions
Can I put a data-only SIM in my phone?
Yes, it will give your phone mobile data, but you will not have a voice number on that SIM. For a phone you usually want a regular plan; data-only SIMs are best for tablets, routers and backup.
Is a data-only SIM cheaper than a normal plan?
Not always — pricing is driven by the data allowance, not by whether voice is included, so a data-only SIM with the same gigabytes can cost about the same as a SIM-only voice plan. Its real advantage is fit: you add data to a tablet, router or backup line without paying for a second phone number or calling features you would not use.
Can I use a data-only SIM as home broadband backup?
Yes — a popular setup is a data-only SIM in a 5G mobile router that automatically takes over if your fixed broadband drops. Choose a generous data allowance (or unlimited with a high fair-use cap) and check the host network is strong at home before relying on it.