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Best broadband deals in St Mary's (TR21)

201 deals reach St Mary's (TR21). The cheapest fixed-line deal is £18.50 a month with Onestream.

Last updated 28 October 202614 providers201 deals
In short

14 providers, including Sky and BT, offer 201 broadband deals, checked . 194 are on a line, 4 by 5G or 4G and 3 by satellite, and the fastest is EE at 1,600 Mbps. Typical measured speed is 56 Mbps down, 45% below the UK download average.

Deals for St Mary's (TR21), checked and refreshed daily.

Best value broadband deal in St Mary's (TR21)

The best value in St Mary's (TR21) is 4th Utility's 300Mb Full Fibre (24 Months), the cheapest deal that is a real step up in speed: £240 across year one, about £20 a month. At 300 Mbps it copes with anything a household runs at once.

How we picked this

The cheapest deal at least 1.3 times faster than the cheapest here, with as much speed per pound. 153 of 194 fixed-line deals qualified. Prices checked 28 October 2026.

Cheapest broadband deal in St Mary's (TR21)

The cheapest deal in St Mary's (TR21) is Fibre 40 from Onestream at £18.50 a month for 40 Mbps. 4th Utility is essentially level at £20.00 a month. Well below the UK average, which shows on a busy evening.

Cheapest in St Mary's (TR21)

Onestream logo

Fibre 40

40Mbps download
Part fibre24-month contract£0 upfront

£18.50/mo

rises to £21.25 in April 2027 (+£2.75)

Full details
How we picked this

The lowest cost over the first year, out of 194 fixed-line deals here. Prices checked 28 October 2026.

Fastest broadband deal in St Mary's (TR21)

The fastest deal available in St Mary's (TR21) is Full Fibre 1.6GB from EE at 1,600 Mbps. Sky matches it at the same top speed.

Fastest in St Mary's (TR21)

EE logo

Full Fibre 1.6GB

1600Mbps download
Full fibre24-month contract£80 Reward Card+£30 upfront

£36.99/mo

rises to £40.99 in March 2027 (+£4)

Full details
How we picked this

The highest advertised download speed out of 201 broadband deals here, the cheaper one on a tie. Prices checked 28 October 2026.

Runner-up on speed

Sky logo

Sky Full Fibre 1.6GB

1600Mbps download
Full fibre24-month contract£95 Gift Card+£5 upfront

£38/mo

may rise during contract

Full details

Compare broadband deals in St Mary's (TR21)

Plusnet logo

Full Fibre 900

900Mbps download
Full fibre24-month contract£150 Reward Card£0 upfront

£26.99/mo

rises to £30.99 in March 2027 (+£4)

Full details
BT logo

Full Fibre 300

300Mbps download
Full fibre24-month contract£120 Reward Card£0 upfront

£25.99/mo

rises to £29.99 in March 2027 (+£4)

Full details
Where these figures come from

Prices checked 28 October 2026.

Broadband providers in St Mary's (TR21)

14 providers serve St Mary's (TR21) including Sky, BT and Vodafone, with EE the fastest at 1,600 Mbps.

Ranked by Ofcom complaints per 100,000 customers, fewest first. What the arrows mean

Ofcom records the typical St Mary's (TR21) download speed at 56 Mbps.

Where these figures come from

Prices checked 28 October 2026.

Satellite broadband in St Mary's (TR21)

Starlink needs a dish with a clear view of the sky. Its home plans cost from £40 to £80 a month on a one-month contract, with £19 upfront.

Broadband in St Mary's (TR21): the local picture

Smaller networks
Two smaller networks carry deals here: Rise Fibre and 4th Utility.

Source: The deals we list in St Mary's (TR21), checked 28 October 2026.

Gigabit, compared
Gigabit broadband reaches 61% of premises here, lower than in 81% of postcode districts across the UK.

Source: Ofcom Connected Nations, data to January 2026.

Upgrade nudge

Room to upgrade in St Mary's (TR21)

Only 0% were on 300Mbps or faster in May 2023, even though 61% can now get gigabit.

Is your broadband good enough?

The typical St Mary's (TR21) line runs 56 Mbps.

Working from home

Multiple devices at onceShould cope
14 Mbps average upload (UK average upload: 27 Mbps).

Streaming and family use

OK
4K Netflix/YouTube screens2+ at once
Download a film (5GB)~12 min
Household of 4 to 5 peopleShould be fine

Where these figures come from: Ofcom Connected Nations, data to January 2026.

What speeds are people actually getting?

Gigabit reaches 61% of St Mary's (TR21). The full split by band is below.

300Mbps+ (Ultrafast fibre)0%
30 to 300Mbps (Superfast)81%
10 to 30Mbps (Standard)12%
Under 10Mbps (Below decent)7%
~430homes here could already be on a faster line than they are.

Where these figures come from: Ofcom Connected Nations, data to January 2026.

What broadband coverage does St Mary's (TR21) have?

Superfast broadband reaches 96% of St Mary's (TR21) premises but gigabit only 61%, so around 35% of homes can get fast broadband but not the fastest.

0.7%
below decent broadband
Almost every premises in St Mary's (TR21) meets the minimum broadband standard, though slightly above the UK average of 0.4%.
MetricSt Mary's (TR21)UK AvgDiff
Superfast (30Mbps+)96.0%94.6%+1.5%
Ultrafast (100Mbps+)61.1%81.0%-24.5%
Ultrafast (300 Mbps+)61.1%82.6%-26.0%
Gigabit-capable61.1%80.1%-23.7%
Below decent broadband0.7%0.4%Worse

Where these figures come from: Ofcom Connected Nations, data to January 2026. See how every UK region compares in The State of UK Broadband.

How St Mary's (TR21) compares within Isles of Scilly

Across 5 postcode districts in Isles of Scilly, by connection count, typical speed and gigabit coverage.

Connections
1st of 5
82.3% of Isles of Scilly · 709 connections
Typical speed
2nd of 5
56 Mbps · Isles of Scilly 56 Mbps
Gigabit coverage
2nd of 5
61% · Isles of Scilly 50%
Largest postcode districts in Isles of Scilly
AreaConnections
St Mary's (TR21)709
Fastest postcode districts in Isles of Scilly
AreaTypical speed
St Mary's (TR21)56 Mbps
Best gigabit coverage in Isles of Scilly
AreaGigabit
St Mary's (TR21)61%

Where these figures come from: Ofcom Connected Nations, data to January 2026.

Frequently asked questions

What broadband speed can I get in St Mary's (TR21)?
Typical speeds in St Mary's (TR21) are 56 Mbps, behind the UK average. Slow speeds are often down to an older package rather than the line itself, so it is worth comparing what is on offer.
Can I get fibre broadband in St Mary's (TR21)?
Fibre is available in much of St Mary's (TR21), though not everywhere: gigabit broadband reaches 61% of premises. Check your address to see if yours is one of them.
What is the cheapest broadband in St Mary's (TR21)?
Fibre 40 from Onestream costs £18.50 a month, the cheapest price we found in St Mary's (TR21), for 40 Mbps on part-fibre. The cheapest deal you can order may be different, because the networks on your street decide which providers can connect you.
Why is my broadband slow in St Mary's (TR21)?
Slow broadband usually comes down to an old package, an older type of line or busy evening times, and in St Mary's (TR21) the typical speed is 56 Mbps, below the UK average. Often the fix is a new package on the same line.
What upload speed can I get in St Mary's (TR21)?
Upload speeds in St Mary's (TR21) average around 14 Mbps. A full-fibre (FTTP) connection delivers the best upload performance.
Can I get gigabit broadband in St Mary's (TR21)?
Gigabit broadband is available at about 61% of premises in St Mary's (TR21). Whether you can get it depends on your address, so check yours.
Is 5G home broadband available in St Mary's (TR21)?
Outdoor 5G covers 95% of premises in St Mary's (TR21), so a 5G hub is a real choice here. The hub plugs in, connects to the mobile network and gives you broadband without an engineer visit.

Ready to switch

See what's actually live in St Mary's (TR21).

Compiled by the FindBroadband team: how these local pages work and how we rank deals.