iD Mobile is the MVNO originally launched by Carphone Warehouse and now under the Currys umbrella, running on Three's network. It offers both SIM only plans and pay monthly phone contracts, and has built its reputation around data rollover and Currys in-store support. This review covers what iD Mobile actually offers, how it performs, and who it suits.
iD Mobile is a solid choice if you want a named-brand device or plan on Three's network, value data rollover, and prefer the option of Currys in-store support. It's not always the outright cheapest option on Three's network (Smarty, for example, often undercuts it on unlimited data), so compare live prices and any mid-contract rise shown on each deal card.
Worth considering if you want Currys in-store support or data rollover. Worth comparing further if pure lowest-price is your only priority.
What is iD Mobile?
iD Mobile is an MVNO: it doesn't own or operate any physical network infrastructure itself, instead running on Three's UK network under a wholesale agreement. It was originally launched by Carphone Warehouse in 2015 and now sits under Currys, following the retail group's consolidation of the Carphone Warehouse and Dixons brands. Because of this heritage, iD Mobile plans and devices are sold both online and through Currys stores, a genuine point of difference from most budget MVNOs, which are online-only.
Coverage and network quality
Since iD Mobile runs on Three's network, coverage and speeds are identical to a direct Three contract; there's no difference in signal quality between the two. Three's network provides strong urban coverage across the UK, including solid 4G and growing 5G availability in cities and commuter areas. Rural coverage is generally patchier than EE or O2, so if you regularly spend time in remote parts of the UK, it's worth checking Three's coverage map for your specific area before committing.
Pricing positioning
iD Mobile sits in the mid-range on price. It's not usually the single cheapest option on Three's network (Smarty, for example, often undercuts it for unlimited data plans), but it's competitive for most users. Mid-contract price-rise terms vary by deal. Smart Comparison displays rise amounts on deal cards when the live feed includes them, so check the disclosure on the specific plan rather than assuming every tariff has the same terms for the full contract length.
For current live pricing, compare iD Mobile directly against other networks. Prices change regularly, so it's worth checking today's numbers rather than relying on a general positioning statement like this one.
Customer service
Being backed by Currys gives iD Mobile a genuine advantage most budget MVNOs can't match: in-store support at Currys locations around the UK, alongside the usual online and app-based support. There's no dedicated standalone phone helpline, but the option to sort out an issue in person is a real point of difference if you'd rather not deal with online-only support.
Contract flexibility and useful features
iD Mobile offers both SIM only plans and pay monthly phone contracts, with a device range covering everything from budget handsets to current flagships. Two features stand out in day-to-day use:
- →Data rollover: any data you don't use in a given month carries forward to the next, so you're not simply losing what you've paid for.
- →EU roaming included at no extra cost on standard plans, covering calls, texts and data while travelling in the EU.
Who iD Mobile suits best
iD Mobile makes the most sense if you want a named-brand device or plan on Three's network and value data rollover or Currys in-store support. It's also a good fit if your data usage varies month to month, since rollover means you're not penalised for a lighter month, or if you'd simply rather have the option of sorting out account issues in a Currys store rather than only online.
If your only priority is the lowest possible headline price, it's worth comparing iD Mobile against other Three-network MVNOs like Smarty, since iD Mobile isn't usually the cheapest. Its value comes from packaging and support options rather than being the rock-bottom option. Always factor in any mid-contract rise shown on the deal card when comparing total cost.
iD Mobile is also an MVNO in the same sense as giffgaff, Smarty, VOXI and Lebara: it doesn't own any network infrastructure of its own. Read our guide to how MVNOs work if you want to understand the wholesale model behind budget networks like this one.
Compare iD Mobile against other networks
See how iD Mobile's current pricing stacks up against every other SIM only and contract option.
Compare iD Mobile deals →Frequently asked questions
Is iD Mobile any good in 2026?
Generally, yes, particularly if you want a named-brand phone contract or SIM plan on Three's network with data rollover and Currys in-store support. Coverage and speeds match a standard Three contract. The main things to check before signing up are whether Three's coverage is strong in your area, how the live deal pricing compares with other Three-network options, and any mid-contract price-rise disclosure shown on the deal card.
What network does iD Mobile use?
iD Mobile is an MVNO that runs on Three's UK network. Coverage, 4G and 5G availability are the same as a direct Three contract. The difference is in how the plans and devices are sold and priced, not the underlying signal.
Does iD Mobile have mid-contract price rises?
It depends on the specific deal. Smart Comparison shows mid-contract price-rise amounts on deal cards when the live feed includes them. Many current iD Mobile phone contracts list a rise; SIM plans should be checked individually. Do not assume every iD Mobile tariff is fixed for the full term. Use the disclosure on the plan you are comparing.
Can I buy an iD Mobile contract in-store?
Yes. This is one of iD Mobile's more distinctive features for an MVNO. Because it's owned by Currys (having originally been launched by Carphone Warehouse), iD Mobile plans and devices are available in Currys stores as well as online, giving you an in-person option that most budget MVNOs (which tend to be online-only) don't offer.
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