iD Mobile Discount Codes & Deals

How to Save at iD Mobile

iD Mobile is a UK mobile virtual network operator wholly owned by Currys plc, running on the Three network since May 2015 and now serving more than 2 million subscribers. The brand sits in the same MVNO bracket as Smarty (also on Three), Lebara (Vodafone) and 1pMobile (EE), but the Currys parentage adds something none of the others match — a 360+ store high-street footprint through Currys and Carphone Warehouse, where SIMs and contract upgrades can be handled face-to-face rather than via post.

Most of the saving at iD Mobile sits inside the bundled plan pricing rather than in a rotating promotional code stack, and the operational features are what make the monthly cost predictable: bill capping (set a hard monthly spending limit so out-of-bundle charges cannot surprise you), inclusive 5G across every tier, data rollover from the previous month, and EU roaming across 50 destinations are baked into the standard plans rather than dangled as time-limited promos.

There is one standing code worth knowing about, though. IDM10OFF takes £10 off the upfront cost on selected pay monthly handset contracts, provided the upfront cost is more than £10 — so it is worth most on the mid-upfront plans and does nothing on a zero-upfront deal. Alongside it, iD Mobile runs two landing pages of handset and SIM-only plans that are not surfaced in the standard shop navigation, plus a double-data promotion on selected SIM-only plans. All four are on the iD Mobile store page.

One thing to check before you order, whichever route you take: iD Mobile plans carry a mid-contract price increase, and each plan states its own uplift date and new monthly figure on the plan detail page. The advertised monthly price is the starting price, not the price for the full contract length — so compare on total cost over the term rather than on the headline figure.

What iD Mobile Sells

The product line splits across two main routes:

• 24-month pay-monthly contracts bundling a handset with a SIM and a monthly data allowance, sold both online and through Currys and Carphone Warehouse stores
• SIM-only plans on flexible 1-month, 12-month and 24-month terms, with the 1-month rolling tier useful for travel SIMs and trial periods before committing to a longer term
• 5G access included on every plan at no extra cost — Three's 5G network reaches a meaningful share of the UK population and tested 5G speeds average above 200 Mbps
• EU roaming across 50 destinations with a 30GB EU fair-use cap, after which data add-ons apply
• Data rollover of unused allowance into the following month (does not compound — rolled-over data expires after that single month)

The contract handset bundles compete directly with the major networks' contract divisions (EE, O2, Vodafone) and with the contract operations at Carphone Warehouse and Mobile Phones Direct. The SIM-only side sits in the value-MVNO bracket — broadly priced alongside Smarty, Asda Mobile and Tesco Mobile rather than the premium tier of EE and Vodafone direct.

How iD Mobile Compares to Other UK Mobile Providers

The MVNO competitive set sorts by underlying network:

Three network MVNOs:

• iD Mobile — Currys-owned, bill capping, data rollover, EU roaming across 50 destinations
• Smarty — flexible monthly plans, data rollover, no roaming on cheaper tiers

EE network MVNOs:

• Mozillion — no mid-contract price rises, refurbished phone marketplace, Travel eSIMs
• 1pMobile — 1p-per-unit PAYG floor, 14-day money-back guarantee

Vodafone network MVNOs:

• Asda Mobile — supermarket distribution through 360+ Asda stores
• Lebara — international calling rates

Other ethical / specialist:

• Ecotalk — Ecotricity-linked, no mid-contract rises, profits fund rewilding

Three is the underlying differentiator that iD Mobile shares with Smarty — both inherit the same rural and motorway coverage footprint, so the practical comparison usually comes down to bill capping (iD Mobile), the high-street store network (iD Mobile via Currys), and the per-tier pricing on the SIM-only ladder.

Practical Buying Tips

Bill capping is the iD Mobile feature most worth activating at sign-up — set the cap at £0 to block out-of-bundle premium rate calls, accidental data overages outside roaming allowances, and unexpected international call costs outright. This is the cleanest way to make a SIM-only plan behave like a true flat monthly cost, which matters disproportionately on accounts where the monthly bill should be predictable (kids' phones, work SIMs being expensed back, second-line backup SIMs).

For EU travel, the included 50-destination roaming allowance covers the standard European holiday set including Spain, Italy, France, Greece, Portugal and Ireland — the 30GB fair-use cap is generous enough for two-week trips with heavy navigation and streaming use. For destinations outside the 50-country list (USA, Canada, Asia, Australia), data-only add-ons apply from £5 at time of writing, which is where pre-purchasing a travel eSIM from a specialist like Mozillion, BambooSIM or Airalo often beats the per-trip data add-on pricing.

For mid-contract price rises, the £1.80 a month flat fee from April 2027 onwards is more predictable than the RPI+3.9% formula at BT, Vodafone and O2 but is not the same as the no-rise guarantees offered by Mozillion and Ecotalk. At typical RPI levels around 4–6%, the £1.80 cap works out cheaper for plans priced above roughly £15 a month and more expensive for entry-level SIMs below that threshold — model the figure against the headline plan price before committing.

For first-time switchers, the Currys store handover route is a real advantage if you want a face-to-face SIM activation, a printed contract on the day, or any of the older household members in the family. The online route is faster end-to-end, but the in-store option does not exist at Smarty, 1pMobile or Ecotalk.

For comparison shopping across other UK mobile providers, the Mobile & Telecoms category page lists SIM-only, PAYG, refurbished-handset and travel-eSIM brands across the same competitive set.

Summary

iD Mobile is a Currys-owned UK MVNO on the Three network combining 24-month handset contracts, 1-month and 12-month SIM-only plans, included 5G, data rollover and EU roaming across 50 destinations into a single product line with a 360-strong high-street footprint via Currys and Carphone Warehouse stores. The standout operational features are bill capping (a hard monthly spending limit that can be set at £0 to block all out-of-bundle charges), the in-store activation route that no other UK MVNO matches, and a £1.80-a-month flat mid-contract price rise from April 2027 onwards that is more predictable than the RPI+3.9% formula at the Big Three carriers. Check the iD Mobile store page for verified deals as they become available.

Related Guides

• 1pMobile Discount Codes & Deals
• Mozillion Discount Codes & Deals
• BetterRoaming Discount Codes & Deals