Compare iD Mobile SIM only deals May 2026

Compare iD Mobile SIM only deals

iD Mobile offers a wide range of SIM only plans with different data allowances, all including unlimited UK calls and texts.

You can choose between 30-day rolling plans or longer 12 and 24-month contracts. Prices typically start from around £6 per month for lower-data plans, with higher allowances available at higher monthly costs.

Our best iD Mobile SIM deals this week

Why choose an iD Mobile SIM?

• Flexible plans: According to iD Mobile, you'll have a choice of 30-day, 12-month and 24-month contracts
• Data rollover: Unused data can roll over to the next month
• Spending cap: Set a monthly cap to control out-of-plan costs
• Strong coverage: Uses Three’s network, covering most of the UK - with the highest 'Time on Network' score of any mobile network at 99.4%. iD Mobile states that its 4G network covers 99% of the UK
• 5G included: Available at no extra cost on compatible devices and in supported areas. Because iD Mobile uses Three's network, it benefits from the fastest 5G download speeds (187Mbps) and upload speeds (20.2Mbps) in the UK. iD Mobile says it offers 5G access in over 615 locations
• EU roaming: iD Mobile says its inclusive roaming is offered in over 50 destinations, subject to fair usage limits

What to look for in an iD Mobile SIM contract

When choosing an iD Mobile SIM, the key factors to consider are your data allowance, contract length and monthly budget.

All plans include unlimited UK calls and texts, so your main decision is how much data you need. If you want flexibility, a 30-day plan may suit you, while longer contracts can offer better value.

Is iD Mobile a good network?

iD Mobile runs on Three’s network and supports both 4G and 5G, and says its network covers 99% of the UK outdoor population, while 5G is available in over 615 locations. However, coverage can still vary by location, signal strength, terrain and whether you’re indoors or outdoors.

It can be a strong choice for value-focused users who want generous data allowances, flexible SIM only plans and features such as data rollover. It's also rated highly on Trustpilot, with an Excellent score of 4.3 stars from over 60,000 reviews.

Ofcom's 2025 Pricing and Consumer Engagement report found that smaller providers like iD Mobile offered the lowest pay-monthly SIM only prices. In fact, iD Mobile offered the lowest-priced pay-monthly SIM only tariffs with 10-100GB of inclusive data every month from March 2023 to September 2025.

Three also performed well for 5G speeds in OpenSignal’s January 2026 UK Mobile Network Experience report, although EE led overall and O2 ranked highest for overall coverage.

Read our full iD Mobile network review here.

How does SMARTY compare to other UK networks?

Data sourced from Opensignal Mobile Network Experience Report January 2026

iD Mobile’s best unlimited data SIMs

iD Mobile offers unlimited data plans across different contract lengths, making them suitable for heavy users who stream, browse or use their phone as a hotspot.

These plans include unlimited UK calls and texts, along with 5G access where available. As with all networks, usage is subject to fair use policies.

iD Mobile’s best rolling contract SIMs

iD Mobile offers 30-day rolling SIM only plans, giving you the flexibility to change or cancel your plan each month.

These plans include unlimited UK calls and texts and a range of data allowances, along with features like data rollover.

iD Mobile’s best 12-month SIM deals

iD Mobile’s 12-month SIM only plans offer a balance between flexibility and lower monthly pricing.

They include unlimited UK calls and texts, a choice of data allowances and access to features like data rollover and spending caps.

iD Mobile’s cheapest SIM only deals

iD Mobile’s cheapest SIM only deals are aimed at light users who mainly need calls, texts and a small amount of data.

Prices typically start from around £6 per month for entry-level plans, though this can vary depending on offers. All plans include unlimited UK calls and texts.

Should I get unlimited calls and texts?

All iD Mobile SIM only plans include unlimited UK calls and texts as standard, so you don’t need to factor this into your decision.

Alternatives to iD Mobile

If you’re comparing networks, alternatives like SMARTY, VOXI, giffgaff and iD Mobile’s parent network Three also offer low-cost SIM only deals.

Each network offers different features, pricing and perks, so it’s worth comparing options.

Can I use my iD Mobile SIM abroad?

Yes, iD Mobile allows you to use your allowance in selected destinations, subject to fair usage limits. Roaming policies can vary depending on your plan and destination, so it’s important to check before travelling.

Can I get 5G-enabled iD Mobile SIMs?

Yes, iD Mobile SIMs are 5G-ready. You’ll need a compatible device and to be in an area with 5G coverage to access it.

Can I keep my mobile number if I switch to an iD Mobile SIM-only deal?

Yes, you can keep your number by requesting a PAC (porting authorisation code) from your current provider and giving it to iD Mobile.

Are iD Mobile SIM-only deals cheaper than contracts?

SIM-only deals are often cheaper overall because you’re not paying for a handset. Choosing a SIM-only plan can be more cost-effective if you already have a phone.

Is iD Mobile a good choice for rural networks?

iD Mobile runs on Three’s network, so coverage in rural areas depends on how strong Three’s signal is where you live. In towns and cities, coverage is generally strong, but rural and remote areas can be less consistent than networks such as EE. Before choosing a plan, it’s worth checking iD Mobile or Three’s coverage map for your postcode.

Is iD Mobile a good network for gaming and streaming?

iD Mobile can be a good option for streaming and online gaming if you have strong 4G or 5G coverage in your area. Many SIM only plans include large or unlimited data allowances, which can suit video streaming, music apps and cloud gaming.

For casual gaming, Netflix, YouTube and Spotify streaming, iD Mobile should be more than enough in areas with solid 4G or 5G coverage. Competitive online gamers may want to prioritise networks with stronger consistency and lower latency in their local area.