iD Mobile runs its SIM-only service over the Three network, positioning itself as a budget-friendly alternative that gives customers access to Three's coverage without paying Three's own-brand prices. It's one of the more established budget SIM brands in the UK, making it a common comparison point for anyone shopping for value without wanting to gamble on a less familiar name.
1. iD Mobile and the Three network
Since iD Mobile runs over Three's infrastructure, coverage in a given area should broadly match what Three itself offers. It's worth checking Three's coverage specifically for where you live and work before switching, since this determines your actual signal quality regardless of the iD Mobile branding.
2. Finding the cheapest iD Mobile deal for your usage
As with any SIM-only comparison, the cheapest genuine option depends on matching the data allowance to what you'll actually use rather than picking the lowest headline price regardless of allowance. Our guide to how much mobile data you need can help you work out a sensible starting point before comparing plans.
3. Contract length options
iD Mobile typically offers a range of contract lengths, so it's worth comparing shorter commitments such as a 12-month deal against longer 24-month options, or a 30-day rolling plan if you'd rather avoid a fixed term altogether.
4. iD Mobile vs other budget brands
iD Mobile competes directly with other budget-focused SIM-only brands running on different networks, including giffgaff on O2 and Asda Mobile on Vodafone. Since coverage varies by network and area, it's worth checking which underlying network actually performs best where you live before comparing prices between these brands.
5. Frequently asked questions
What network does iD Mobile use?
iD Mobile runs its SIM-only service over the Three network, giving it access to the same underlying coverage as Three's own customers.
Is iD Mobile cheaper than Three's own SIM-only plans?
iD Mobile is generally positioned as a more budget-focused alternative to Three's own-brand pricing, though it's worth comparing live rates directly to confirm the current difference.
Does iD Mobile offer 5G?
Availability depends on the specific plan and your phone's compatibility, since 5G access varies by provider and handset — check current options directly if 5G matters to you.
Can I switch to iD Mobile and keep my current number?
Yes, using a PAC code from your current provider, which they're required to give you free of charge on request.
6. Conclusion
iD Mobile offers a budget-friendly way to access Three's network coverage, making it a strong option for cost-conscious switchers. Compare its contract lengths and data allowances against your actual usage, and check Three's coverage in your area, before deciding if it's the right fit.
