£15.00 a month
£0.00 upfront · 1-month plan
£15.00 estimated first-month cost
This is not an annual cost. Check renewal and cancellation terms.
Compare SIM-only deals
Keep your phone. Find a monthly plan that fits.
Compare monthly voice-SIM contracts from O2, giffgaff, iD Mobile and Mobiles.co.uk. Prepaid bundles, travel eSIMs and data-only plans are not included yet.
147 offers · Last refreshed 20 Oct 2026, 13:09
Unlimited data (5G)
Unlimited minutes · Unlimited texts
5G SIM Only Unlimited · Sold by Mobiles.co.uk
£15.00 a month
£0.00 upfront · 1-month plan
£15.00 estimated first-month cost
This is not an annual cost. Check renewal and cancellation terms.
£15.00 a month
£0.00 upfront · 12-month contract
Rises to £17.50 from 1 Apr 2027
£195.00 estimated minimum-term cost (listed rises included)
£35.00 cashback advertised: Cashback paid automatically. Not deducted from our costs; eligibility and retailer terms apply.
£15.00 a month
£0.00 upfront · 12-month contract
Rises to £17.50 from 1 Apr 2027
£195.00 estimated minimum-term cost (listed rises included)
£15.00 a month
£0.00 upfront · 12-month contract
Rises to £17.50 from 1 Apr 2027
£195.00 estimated minimum-term cost (listed rises included)
£72.00 cashback advertised: Cashback by redemption. Not deducted from our costs; eligibility and retailer terms apply.
Unlimited data (5G)
Unlimited minutes · Unlimited texts
5G SIM Only Unlimited · Sold by Mobiles.co.uk
£15.00 a month
£0.00 upfront · 12-month contract
£180.00 estimated minimum-term cost
£30.00 cashback advertised: Cashback paid automatically. Not deducted from our costs; eligibility and retailer terms apply.
Unlimited data (5G)
Unlimited minutes · Unlimited texts
5G SIM Only Unlimited · Sold by Mobiles.co.uk
£15.00 a month
£0.00 upfront · 24-month contract
£360.00 estimated minimum-term cost
Unlimited data (5G)
Unlimited minutes · Unlimited texts
5G SIM Only Unlimited · Sold by Mobiles.co.uk
£15.00 a month
£0.00 upfront · 24-month contract
£360.00 estimated minimum-term cost
£15.00 a month
£0.00 upfront · 24-month contract
Rises to £17.50 from 1 Apr 2027
Rises to £20.00 from 1 Apr 2028
£420.00 estimated minimum-term cost (listed rises included)
£204.00 cashback advertised: Cashback by redemption. Not deducted from our costs; eligibility and retailer terms apply.
£15.00 a month
£0.00 upfront · 24-month contract
Rises to £17.50 from 1 Apr 2027
Rises to £20.00 from 1 Apr 2028
£420.00 estimated minimum-term cost (listed rises included)
£15.00 a month
£0.00 upfront · 24-month contract
Rises to £17.50 from 1 Apr 2027
Rises to £20.00 from 1 Apr 2028
£420.00 estimated minimum-term cost (listed rises included)
£115.00 cashback advertised: Cashback paid automatically. Not deducted from our costs; eligibility and retailer terms apply.
£8.00 a month for 3 months, then £16.00 a month
£0.00 upfront · 12-month contract
£168.00 estimated minimum-term cost
£16.00 a month
£0.00 upfront · 24-month contract
Rises to £18.50 from 1 Apr 2027
Rises to £21.00 from 1 Apr 2028
£444.00 estimated minimum-term cost (listed rises included)
£144.00 cashback advertised: Cashback by redemption. Not deducted from our costs; eligibility and retailer terms apply.
£16.00 a month
£0.00 upfront · 24-month contract
Rises to £18.50 from 1 Apr 2027
Rises to £21.00 from 1 Apr 2028
£444.00 estimated minimum-term cost (listed rises included)
£60.00 cashback advertised: Cashback paid automatically. Not deducted from our costs; eligibility and retailer terms apply.
£16.00 a month
£0.00 upfront · 24-month contract
Rises to £18.50 from 1 Apr 2027
Rises to £21.00 from 1 Apr 2028
£444.00 estimated minimum-term cost (listed rises included)
£16.00 a month
£0.00 upfront · 12-month contract
Rises to £18.50 from 1 Apr 2027
£207.00 estimated minimum-term cost (listed rises included)
£132.00 cashback advertised: Cashback by redemption. Not deducted from our costs; eligibility and retailer terms apply.
£16.00 a month
£0.00 upfront · 12-month contract
Rises to £18.50 from 1 Apr 2027
£207.00 estimated minimum-term cost (listed rises included)
£85.00 cashback advertised: Cashback paid automatically. Not deducted from our costs; eligibility and retailer terms apply.
£17.00 a month
£0.00 upfront · 12-month contract
£204.00 estimated minimum-term cost
£17.00 a month
£0.00 upfront · 24-month contract
£408.00 estimated minimum-term cost
£17.00 a month
£0.00 upfront · 12-month contract
Rises to £19.50 from 1 Apr 2027
£219.00 estimated minimum-term cost (listed rises included)
£40.00 cashback advertised: Cashback paid automatically. Not deducted from our costs; eligibility and retailer terms apply.
Before you switch
Monthly sorting and the price cap use the standard price after any introductory discount, before future rises. Average cost is the estimated minimum-term cost divided by its length, not a guaranteed ongoing bill. Cashback is never deducted. Some retailers sell the same plan.
Check coverage where you live and work, your phone’s compatibility, minimum term, cancellation rules and any credit check. A one-month plan cost is not a yearly cost. Listed rises are included in our estimate; missing rises do not mean a price freeze. Check current prices, renewal terms and eligibility with the retailer before applying.
We may earn commission through retailer links. Saved SIM plans have their own comparison group, separate from phones. SIM-only deals are not yet included in the phone-finder assistant.
SIM-only or a phone contract? · How to keep your number when switching