Best iD Mobile SIM Only Deals

Written by Leena

Senior Editor

Updated on February 20, 2026

Looking for a cheap, flexible SIM only plan with great coverage and data perks?
iD Mobile SIM only deals are among the most popular and best-value offers in the UK, powered by the Three network and packed with extras like data rollover, EU roaming, and bill capping.

Why Choose iD Mobile?

1-Month & 12-24 Month Contracts – choose total flexibility or long-term value.
Data Rollover – keep any unused data for next month.
Free EU Roaming in 50 Destinations – perfect for frequent travellers.
Bill Capping – stay in control of your monthly spend.
5G on the Three Network – fast speeds without the premium price.

Top iD Mobile Plans This Month

iD Mobile SIM Only

Uses Three’s Network

200GB

of 5G data

1 Month Contract

£12

50 Roaming Destinations

30GB

🇦🇹 Austria
🇦🇿 Azerbaijan
🇵🇹 Azores
🇧🇾 Belarus
🇧🇪 Belgium
🇧🇬 Bulgaria
🇪🇸 Canary Islands
🇭🇷 Croatia
🇨🇾 Cyprus
🇨🇿 Czech Republic
🇩🇰 Denmark
🇪🇪 Estonia
🇫🇮 Finland
🇫🇷 France
🇩🇪 Germany
🇬🇮 Gibraltar
🇬🇷 Greece
🇬🇵 Guadeloupe
🇬🇬 Guernsey
🇬🇫 Guyane (French Guiana)
🇭🇺 Hungary
🇮🇸 Iceland
🇮🇪 Ireland
🇮🇲 Isle of Man
🇮🇹 Italy
🇯🇪 Jersey
🇰🇿 Kazakhstan
🇱🇻 Latvia
🇱🇮 Liechtenstein
🇱🇹 Lithuania
🇱🇺 Luxembourg
🇵🇹 Madeira
🇲🇹 Malta
🇲🇶 Martinique
🇲🇨 Monaco
🇳🇱 Netherlands
🇲🇰 North Macedonia
🇳🇴 Norway
🇵🇱 Poland
🇵🇹 Portugal
🇷🇪 Réunion
🇷🇴 Romania
🇧🇱 Saint-Barthélemy
🇲🇫 Saint-Martin
🇸🇲 San Marino
🇸🇰 Slovakia
🇸🇮 Slovenia
🇪🇸 Spain
🇸🇪 Sweden
🇻🇦 Vatican City

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

Unlimited

5G data

1 Month Contract

£15

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

54GB

of 5G data

12 Months Contract

£4.50

for 3 Months,

then £9

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

45GB

of 5G data

12 Months Contract

£4.50

for 3 Months,

then £9

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

250GB

of 5G data

1 Month Contract

£14

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

200GB

of 5G data

1 Month Contract

£12

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

54GB

of 5G data

12 Months Contract

£9

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

45GB

of 5G data

12 Months Contract

£9

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

Unlimited

5G data

1 Month Contract

£16

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

250GB

of 5G data

1 Month Contract

£14

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

200GB

of 5G data

1 Month Contract

£12

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

200GB

of 5G data

12 Months Contract

£7

for 3 Months,

then £14

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

250GB

of 5G data

24 Months Contract

£14

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

250GB

of 5G data

1 Month Contract

£14

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

Unlimited

5G data

1 Month Contract

£15

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

200GB

of 5G data

1 Month Contract

£12

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

Unlimited

5G data

12 Months Contract

£8.50

for 3 Months,

then £17

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

80GB

of 5G data

12 Months Contract

£5

for 3 Months,

then £10

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

Unlimited

5G data

24 Months Contract

£8

for 6 Months,

then £16

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

iD Mobile SIM Only

Uses Three’s Network

100GB

of 5G data

24 Months Contract

£5

for 6 Months,

then £10

50 Roaming Destinations

30GB

Up to 2 months free Apple Fitness+, Music & Arcade

See All Sim Only Offers

iD Mobile vs Other Networks

Compared with O2, Vodafone, or EE, iD Mobile consistently offers more data for less and still includes free roaming across 50 EU destinations — something most rivals have dropped.
All plans run on Three’s reliable 5G network, making iD Mobile one of the best value SIM only choices for UK users.

Who Is iD Mobile Best For?

Ideal for students, commuters, and budget-conscious users who want low-cost, high-data SIMs with transparent pricing.
Its data rollover and bill cap features make it a smart pick for families and anyone watching their spending.

How to Switch to iD Mobile

Order your free SIM online from iDMobile.co.uk.
Get your PAC code from your old network.
Activate your new iD Mobile SIM – your number will transfer within 1 working day.

See our detailed guide on How To Switch Sim Providers

Final Verdict

Active and valid iD Mobile SIM only deals deliver outstanding value with free roaming, data rollover, and affordable pricing.
If you’re after a cheap, flexible, and reliable SIM only offer, iD Mobile remains one of the UK’s top choices.

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Best iD Mobile SIM Only Deals

Written by Leena

On This Page

Why Choose iD Mobile?

Top iD Mobile Plans This Month

iD Mobile SIM Only

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iD Mobile SIM Only

iD Mobile SIM Only

iD Mobile SIM Only

iD Mobile vs Other Networks

Who Is iD Mobile Best For?

How to Switch to iD Mobile

Final Verdict

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