What are family SIM deals?
Family SIM deals are discounts a network gives you for putting more than one mobile line on the same account. Instead of you, your partner and your teenager each shopping separately, you add every SIM to one bill and the network knocks a bit off each extra line. It sounds like a small tweak. For a household running three or four phones, it often isn’t.
Most big networks now run some version of a family SIM deals scheme. EE calls its scheme a multi line discount. Vodafone calls its version Vodafone Together. Three lets you stack accounts for a percentage off. Smarty, which runs on Three’s network, cuts the price of every SIM you add to a household. The mechanics differ, the principle doesn’t: one account, several lines, a lower price per line than you’d pay going it alone.
How much can family SIM deals save you?
The honest answer is it depends on your networks and how many lines you’re adding, so treat any figure here as a rough guide rather than a promise. EE’s multi line discount can knock up to around £10 a month off each extra SIM only or airtime plan on the account. Three has advertised savings of up to roughly 20% across bundled plans. Smarty’s structure adds about 10% off for each extra SIM, up to a handful of lines.
Stack that across a household of four and the pounds add up faster than a single line saving ever could. It’s also one of the few mobile discounts that rewards you simply for staying put and consolidating, rather than for switching every year. Worth checking against what you’re currently paying on separate accounts before you assume it’s the cheaper route, since a rock bottom individual SIM only deal can sometimes still beat a family bundle.
Which networks offer family SIM deals in 2026?
EE, Vodafone, Three, O2 and Tesco Mobile all run some form of multi line or household discount, alongside smaller players like Smarty and 1pMobile that build the saving into every extra SIM you add. Some let you gift or pool data across the account, so a light using parent can top up a teenager who burns through their allowance streaming on the school bus.
Not every plan on every network qualifies for family SIM deals, and the discount usually applies to the second and later lines rather than the first. If you’re the sort of household that’s never quite got round to comparing what’s actually on the market, our guide to cheap mobile networks is a useful starting point before you commit a whole family to one provider.
Are family SIM deals actually cheaper than separate contracts?
Sometimes, yes. But not automatically, and this is where the Do Nothing Default sneaks in. It’s easy to bundle everyone onto one account, feel like you’ve done the sensible thing, and never check again. Meanwhile a rival network might be running a SIM only deal so cheap that four separate accounts would still beat the bundle.
The way to know is to add up what you’re paying now across every phone in the house, then compare that total against a family bundle and against four of the market’s best individual SIM only deals. If you’re still tied into old contracts on some of those lines, our guide to SIM only deals explains what you’re paying for once you own the handset outright.
Watch the contract length
Family bundles often ask you to commit every line to the same term, sometimes 24 months, which can trap a line that’s actually happy on a rolling monthly plan. Read the small print on notice periods before you merge everyone onto one account.
What should you check before switching to a family SIM deals plan?
Start with usage, not price. Ofcom’s own switching guidance points out that knowing how you actually use your phone, calls, texts and data, is the first step to picking the right package, and that’s doubly true when you’re choosing one deal to cover several different people’s habits. A gamer teenager and a grandparent who mostly rings the same three numbers need very different allowances.
Check whether the network lets you leave a single line without breaking the whole account, what happens to shared data if one person leaves, and whether the discount is a fixed amount or a percentage that shrinks if you later drop a line. If you do decide to move networks entirely, our guide to switching mobile network and keeping your number walks through the process, which Ofcom’s rules have made a fairly quick free text job for most people.
Key takeaways
- Family SIM deals bundle several lines on one account for a per line discount, roughly £10 a month or up to around 20% depending on the network.
- The saving usually applies to the second line onward, not the first.
- Always compare the bundled total against the best individual SIM only deals before committing the whole household.
- Check contract length and what happens to shared data if someone leaves the account.
- Do all networks offer family SIM deals?
- No. EE, Vodafone, Three, O2 and Tesco Mobile currently run some form of it, plus smaller providers like Smarty, but the terms and discount size vary a lot between them.
- Can I mix SIM only and handset plans in a family SIM deal?
- Usually yes, most networks let you combine SI only lines with airtime plans that include a phone on the same account, though the discount rate can differ between the two.
- Do family SIM deals share data between lines?
- Some do. A few networks let you pool or gift data across the account, so an allowance one person isn’t using can top up someone who’s running low.
- What happens if one person in the family leaves the network?
- The remaining lines usually keep their discount, but it can drop from a percentage based saving to a smaller flat one, so check this before you rely on the total staying the same.
- Are family SIM deals cheaper than a budget MVNO on separate accounts?
- Not always. A very cheap individual SIM only deal can sometimes beat family SIM deals on a bigger network, so it’s worth adding up both totals before you switch everyone over.
