The Sayph phone works with any standard UK SIM card, but we don’t sell SIMs – you buy your own and pop it in. That keeps you free to choose the network and plan that suit your family, and to change it whenever you like. This page is a friendly starting point for that choice: how much data to look for, what picture messaging and Wi-Fi Calling mean in practice, and how a few popular networks compare.
Networks change their plans, prices and features often, so please treat this as a helpful starting point rather than a definitive or guaranteed source. Always confirm the latest details directly with the provider before you buy.
Sayph isn’t responsible for the accuracy of third-party information, and we don’t endorse or recommend any particular network – the networks below are listed to help you get started, not as recommendations. Do your own research to find the right fit.
What to look for in a plan
A Sayph phone is built for calls, texts, maps and (soon) radio – not for heavy browsing or streaming video – so you don’t need a big, expensive plan. Here’s a rough guide to the things worth thinking about.
| Consideration | What we’d suggest looking for |
|---|---|
| Data allowance | About 2–5GB a month is plenty for most children. Maps and location use very little; lean towards the higher end if they’ll stream a lot of radio or music. You almost certainly don’t need unlimited data. |
| Texts | Unlimited texts. This is standard on nearly every plan, so it’s rarely something you’ll need to pay extra for. |
| Minutes | Unlimited minutes, or a generous bundle. Calls to their approved contacts are one of the main things the phone is for. |
| Picture messages (MMS) | If your child will send or receive photos by text, look closely here. Most networks now charge for MMS or sell it as an add-on rather than including it; a few (such as Smarty and VOXI) include it. It’s easier to pick a plan that suits from the start than to add it later. |
| Wi-Fi Calling (VoWiFi) | Handy if home or school has weak mobile signal – it lets calls and texts work over a WiFi connection. See the note below the next table. |
| Contract type | A 30-day rolling SIM-only plan keeps you flexible and easy to change. We’d avoid long lock-in contracts for a first phone. |
| Cost | Low-cost SIM-only plans typically run about £2–8 a month, depending on the data and network. |
Popular UK networks at a glance
These are some of the networks and low-cost providers UK parents often consider. We’ve focused on two things that catch people out: whether picture messaging (MMS) is included, and whether Wi-Fi Calling is supported. Everything here can change, so do check before buying.
| Provider | Network used | Picture messages (MMS) | Wi-Fi Calling (VoWiFi) |
|---|---|---|---|
| Smarty | Three | Included – free on all voice plans | Yes – on supported handsets |
| giffgaff | O2 | Not included – around 30p each (needs credit) | Yes – on supported handsets |
| Tesco Mobile | O2 | Not included – around 55p each | Yes – pay monthly |
| VOXI | Vodafone | Included – unlimited on all plans | Yes – for eligible customers |
| iD Mobile | Three | Not included – charged per message* | Yes |
| EE | EE (own network) | Not included – around 83p each; a photo-message add-on is available | Yes |
| O2 | O2 (own network) | Not included as standard – charged per message, or add a 50-MMS bolt-on (around 10p each) | Yes |
| Three | Three (own network) | Not included – charged per message | Yes |
| Vodafone | Vodafone (own network) | Not included on most plans – around 75p each, or add an unlimited picture-message extra (not on Basics) | Yes |
Compare plans yourself
The best deals change all the time, so it’s worth comparing live prices on an independent site. These let you filter by data, price and network:
- MoneySavingExpert – Cheap SIM-only finder
- Uswitch – SIM-only deals
- MoneySupermarket – SIM-only deals
A few practical tips
- The Sayph phone uses a nano-SIM and works on all major UK networks (EE, Three, O2, Vodafone and the providers that run on them).
- If you live somewhere with patchy mobile reception, check the plan supports Wi-Fi Calling before you commit, so calls and texts still work over WiFi.
- Calls and texts work on any SIM, but live location, maps and remote monitoring need some mobile data to update when your child is away from WiFi. You don’t need a big allowance – just a little data goes a long way.
- If you think your child may want to send picture messages, choosing a plan that includes MMS from the start is simpler than adding it later.
Still unsure? We’re happy to help point you in the right direction – email help@sayph.one. For more about how the phone works, see our Support Centre or the FAQ.
