Best SIM-Only Mobile Phone Deals

Discover the top 5 SIM-only mobile deals available in the UK this month. Compare prices, data, contract length and perks to find the best value for your money.

📊 Top 5 SIM-Only Mobile Deals – June 2025

Looking to save on your mobile phone bill? SIM-only deals offer flexibility, lower costs, and no need to buy a new handset. We’ve researched and compared the best-value SIM card plans from major UK providers so you can spend smart and stay connected.

🔝 1. Lebara – 12GB for £5/month

  • Price: £5/month (first 6 months, then £7.90)

  • Data: 12GB

  • Minutes & Texts: Unlimited

  • Contract: 30-day rolling

  • Network: Vodafone

  • Best For: International calls – includes 100 international minutes

  • Perk: No credit check, no contract

✅ Budget-friendly and perfect for light users or teens.

💡 2. VOXI – Endless Social Media from £10/month

  • Price: £10/month

  • Data: 15GB + unlimited social media use

  • Minutes & Texts: Unlimited

  • Contract: 30-day rolling

  • Network: Vodafone

  • Best For: Social media lovers

  • Perk: Data doesn’t count for Instagram, Facebook, WhatsApp, etc.

✅ Ideal for younger users who scroll a lot!

💼 3. Smarty – 60GB for £10/month

  • Price: £10/month

  • Data: 60GB

  • Minutes & Texts: Unlimited

  • Contract: 1-month, cancel anytime

  • Network: Three

  • Best For: Heavy data users on a budget

  • Perk: WiFi calling included, EU roaming

✅ One of the best data-for-money options.

🌍 4. giffgaff – Golden Goodybag £15/month

  • Price: £15/month

  • Data: 30GB (or 100GB on recurring plan)

  • Minutes & Texts: Unlimited

  • Contract: No contract

  • Network: O2

  • Best For: Flexible users who want solid coverage

  • Perk: Free EU roaming up to 5GB

✅ Great balance of value, flexibility, and community rewards.

⚡ 5. iD Mobile – 100GB for £12/month

  • Price: £12/month

  • Data: 100GB

  • Minutes & Texts: Unlimited

  • Contract: 1-month or 12-month option

  • Network: Three

  • Best For: High data + low cost

  • Perk: Data rollover and bill capping

✅ For streamers, gamers, and work-from-phone users.

🧐 Which SIM Deal Is Right for You?

Provider Data Price Contract Best For
Lebara 12GB £5 30-day International calls
VOXI 15GB + socials £10 30-day Social media fans
Smarty 60GB £10 30-day Heavy data users
giffgaff 100GB (recurring) £15 No contract Flexibility
iD Mobile 100GB £12 30-day or 12-month Power users

💬 Final Thoughts

SIM-only plans are a smart way to reduce your monthly costs without compromising on connectivity. Whether you're after massive data or budget international calls, these top 5 deals cover every need.

➡️ Ready to switch? Make sure your phone is unlocked, then order your SIM online—most providers offer next-day delivery.