Child safe SIM cards, what actually makes a SIM safe

A SIM card is child safe when it controls three things: who can reach your child, what the SIM can reach, and what it can spend. ParentShield, £9 a month on EE, is the only UK SIM built specifically for a child’s phone, and it covers all three. On a basic phone, a £6 Smarty or £4 Lebara is usually enough, because the handset does the safety work.

Knock doesn’t test SIMs in a lab and we’re not the network. This is our reading of each provider’s published tariffs, plus the reasoning behind our own SIM line-up.

Who can reach your child

ParentShield runs a whitelist: you choose which numbers can call or text your child, incoming and outgoing, plus call and text logs and quiet hours. The other SIMs in our line-up don’t: Smarty, Lebara and giffgaff all list parental controls as none. If unknown numbers or cold-call scams are the worry, the whitelist is the feature that answers it.

What the SIM can reach

Mobile data is the second control. ParentShield tariffs run from 250 MB to 5 GB, and the parent account can switch data off entirely. On a budget SIM the lever is the allowance itself: Lebara starts at 1 GB, Smarty at 2 GB. For a no-internet setup, our calls-and-texts-only note has the detail.

What it can spend

Avoid any tariff that lets premium-rate or out-of-bundle charges through, and set a hard spending cap, which most providers offer. On ParentShield the caps sit in the parent account. Every SIM in our line-up runs monthly with no tie-in, so the worst case is one more month at £4 to £9, not a two-year contract.

The purpose-built option

ParentShield costs £9 a month on EE, rolling monthly with no minimum term, and is our first pick for ages 8 to 11. The safeguarding sits at the SIM and network level, so it works on a handset with no controls of its own. The trade-offs: it’s £3 to £5 a month more than the budget SIMs, and an older teenager may object to the visibility.

The budget route

Smarty is £6 a month on Three, Lebara £4 on Vodafone, both rolling monthly with no parental controls at all. On a Nokia 3210 there are no apps and no browser, so the SIM only needs to be cheap and reliable. giffgaff, £6 on O2, suits readers who already trust it.

Where a SIM alone is never enough

On a smartphone, SIM controls stop at the mobile network. Wi-Fi at home or at school goes round the SIM, and so does everything inside apps. A smartphone needs controls on the handset too. It’s part of why we point first-phone families at a simple phone.

Keeping the number when you switch

Ofcom’s text-to-switch scheme: text PAC to 65075, free on every UK network. The code is valid for 30 days; give it to the new provider and they complete the switch within one working day. For a new number instead, text STAC to 75075. Our switching kit walks through the move.

We earn a small commission on marked SIM buy links, through the Awin network, at no cost to you. See affiliate disclosure.

Common questions

What makes a SIM card safe for a child? Three controls: who can call or text the child, whether the SIM has mobile data, and what it can spend. ParentShield, £9 a month on EE, covers all three: a whitelist with call and text logs, data you can switch off, and caps on premium-rate charges.

Can I get a SIM card with no internet for my child? Yes. ParentShield lets you switch mobile data off from the parent account. On a budget SIM, pick a small allowance, from 1 GB on Lebara, and pair it with a phone that has no browser.

Does a basic phone like the Nokia 3210 need a child safe SIM? Not for filtering. A Nokia 3210 runs no apps and has no browser, so there’s nothing for the SIM to block. The case for ParentShield there is the whitelist and the logs.

Is a child safe SIM enough on a smartphone? No. SIM controls stop at the mobile network. Wi-Fi and apps go round them, so a smartphone needs controls on the handset as well.

Next steps: the SIM rankings have prices and buy links, and the ninety-second picker helps if the phone isn’t settled yet.