Three SIM-only deals

20 plans, sorted by average monthly cost. Checked against Three’s website on 17 August 2026.

Three runs its own UK network. Its plans include 5G, eSIM and Wi-Fi calling, while roaming and speed limits vary by plan.

Three

Three runs its own UK network. Its plans include 5G, eSIM and Wi-Fi calling, while roaming and speed limits vary by plan.

Three
Three
Uses Three network
12-month contract
30GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£7.00/mo
until 31 March 2027
  • Then £8.90 a month from 1 April 2027
  • £91.60 total over 12 months
  • Average over 12 months: £7.63 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
12-month contract
60GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£9.00/mo
until 31 March 2027
  • Then £10.90 a month from 1 April 2027
  • £115.60 total over 12 months
  • Average over 12 months: £9.63 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
monthly rolling
60GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 25Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£10.00/mo
cancel or change any time
  • £0 upfront · no contract tying you to future price changes
Get this deal from Three*
Three
Three
Uses Three network
12-month contract
80GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£10.00/mo
until 31 March 2027
  • Then £11.90 a month from 1 April 2027
  • £127.60 total over 12 months
  • Average over 12 months: £10.63 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
24-month contract
60GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£10.00/mo
until 31 March 2027
  • Then £11.90 a month from 1 April 2027 until 31 March 2028
  • Then £13.80 a month from 1 April 2028
  • £278.00 total over 24 months
  • Average over 24 months: £11.58 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
12-month contract
100GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£15.00/mo
until 31 March 2027
  • Then £17.30 a month from 1 April 2027
  • £189.20 total over 12 months
  • £48.00 cashback via buymobiles
  • Average after cashback: £11.77 a month
  • £0 upfront
Get this deal from buymobiles*
Three
Three
Uses Three network
12-month contract
120GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£12.00/mo
until 31 March 2027
  • Then £14.30 a month from 1 April 2027
  • £153.20 total over 12 months
  • Average over 12 months: £12.77 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
monthly rolling
120GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 25Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£13.50/mo
cancel or change any time
  • £0 upfront · no contract tying you to future price changes
Get this deal from Three*
Three
Three
Uses Three network
24-month contract
120GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£12.00/mo
until 31 March 2027
  • Then £14.30 a month from 1 April 2027 until 31 March 2028
  • Then £16.60 a month from 1 April 2028
  • £334.00 total over 24 months
  • Average over 24 months: £13.92 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
12-month contract
250GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£16.00/mo
until 31 March 2027
  • Then £18.30 a month from 1 April 2027
  • £201.20 total over 12 months
  • £25.00 cashback via buymobiles
  • Average after cashback: £14.68 a month
  • £0 upfront
Get this deal from buymobiles*
Three
Three
Uses Three network
12-month contract
Unlimited Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£17.00/mo
until 31 March 2027
  • Then £19.30 a month from 1 April 2027
  • £213.20 total over 12 months
  • £35.00 cashback via buymobiles
  • Average after cashback: £14.85 a month
  • £0 upfront
Get this deal from buymobiles*
Three
Three
Uses Three network
24-month contract
250GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£16.00/mo
until 31 March 2027
  • Then £18.30 a month from 1 April 2027 until 31 March 2028
  • Then £20.60 a month from 1 April 2028
  • £430.00 total over 24 months
  • Average over 24 months: £17.92 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
monthly rolling
240GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 25Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£18.00/mo
cancel or change any time
  • £0 upfront · no contract tying you to future price changes
Get this deal from Three*
Three
Three
Uses Three network
24-month contract
Unlimited Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£22.00/mo
until 31 March 2027
  • Then £24.30 a month from 1 April 2027 until 31 March 2028
  • Then £26.60 a month from 1 April 2028
  • £574.00 total over 24 months
  • Average over 24 months: £23.92 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
monthly rolling
Unlimited Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 25Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£31.50/mo
cancel or change any time
  • £0 upfront · no contract tying you to future price changes
Get this deal from Three*
Show 5 more Three deals — each beaten on price or data by one above
Three
Three
Uses Three network
12-month contract
8GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£7.00/mo
until 31 March 2027
  • Then £8.90 a month from 1 April 2027
  • £91.60 total over 12 months
  • Average over 12 months: £7.63 a month
  • £0 upfront · no cashback required
Get this deal from buymobiles*
Three
Three
Uses Three network
12-month contract
15GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£7.00/mo
until 31 March 2027
  • Then £8.90 a month from 1 April 2027
  • £91.60 total over 12 months
  • Average over 12 months: £7.63 a month
  • £0 upfront · no cashback required
Get this deal from Three*
Three
Three
Uses Three network
12-month contract
12GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£9.00/mo
until 31 March 2027
  • Then £10.90 a month from 1 April 2027
  • £115.60 total over 12 months
  • £20.00 cashback via buymobiles
  • Average after cashback: £7.97 a month
  • £0 upfront
Get this deal from buymobiles*
Three
Three
Uses Three network
24-month contract
12GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£10.00/mo
until 31 March 2027
  • Then £11.90 a month from 1 April 2027 until 31 March 2028
  • Then £13.80 a month from 1 April 2028
  • £278.00 total over 24 months
  • Average over 24 months: £11.58 a month
  • £0 upfront · no cashback required
Get this deal from buymobiles*
Three
Three
Uses Three network
24-month contract
25GB Data5G
Unlimited minutes & texts
eSIM availableWi-Fi calling included
Important to know
  • ⚠Downloads are limited to 100Mbps, even where faster 5G is available
  • ⚠EU roaming is not included on this plan — it costs £2 for each 24 hours you use your phone in the EU
  • −Unused data does not roll over to the next month
£14.00/mo
until 31 March 2027
  • Then £15.90 a month from 1 April 2027 until 31 March 2028
  • Then £17.80 a month from 1 April 2028
  • £374.00 total over 24 months
  • Average over 24 months: £15.58 a month
  • £0 upfront · no cashback required
Get this deal from Three*

Cheapest Three plan is £7.00/mo. Three runs on Three's network — compare it against every other provider using the same masts.

Three FAQ

How much is Three?

The cheapest Three SIM-only plan is £7.00/mo (30GB, 12-month contract). Three sells 20 plans in total, and I check every price against Three's own site daily.

What network does Three use?

Three is a main UK network — it owns and runs its own masts and coverage.

Can I use Three abroad in the EU?

Three includes EU roaming on some plans. £2 in EU per 24hr, other bundles available

Does Three have 5G?

Yes — Three includes 5G.

Does Three support eSIM?

Yes — Three supports eSIM.

Does Three raise prices mid-contract?

Yes — Three raises prices during your contract. Prices rise every April by a fixed amount tied to your data allowance - on plans taken out since 9 Nov 2025: £1.80/month extra for 4GB or less, £1.90 for 5-99GB, £2.30 for 100GB and above (unlimited counts as the top tier). Older plans rise by CPI + 3.9% instead.

Also using the Three network

You can get the same underlying coverage from iD Mobile, SMARTY, simp mobile, Superdrug Mobile and Honest Mobile, although prices, speeds, roaming and customer support differ. See the networks on Three →

Compare UK networks side by side →

Feature and price data is checked by Scrimpr against Three's own site and public documentation. Networks change plans often — always confirm details on the provider's site before buying. Some links are affiliate links (marked *), which support Scrimpr at no cost to you.