Guernsey 20GB 30 days
Sure
- Data
- 20GB
- Validity
- 30 days
- Hotspot
- Yes
- Technology
- 3G / 4G
- Hotspot
- Top-up ready
- Long stay
Validity starts on first connection at the destination
- 4G only, no 5G
- One network
from$53.90$51.20
Sure and travel eSIM in Guernsey
Sure is one of the networks your eSIM may use in Guernsey. Here is who actually decides which network you get, and what to do with that.
Author: Bob Kanokphon Thongdee · Co-founderReviewed by: Porsch Kunnipat SiramanakulPublished: October 11, 2026Last updated: October 11, 2026
Quick answer
- 5 of the 16 Guernsey plans we sell name Sure as a reachable network, at 4G.
- Sure runs LTE on B20, B3, B7; your phone needs at least one of them.
- Travel plans connect by roaming, so no plan can promise one specific network.
Sure in brief
Sure is upgrading its Guernsey mobile network in phases from July 2026, consolidating the Sure and Airtel networks to cut masts by about a third, with 3G switched off from June.
We are not a reseller for this operator and we have not run our own field speed tests. The band and network details below come from the sources listed at the end of the page.
Sure's bands and technology
| Item | Sure |
|---|---|
| LTE (4G) | B20, B3, B7 |
| 5G NR | Not verified |
| 5G launched | Not verified |
| Network code (MCC-MNC) | 234-55 |
Checked against the sources on 2026-10-11. Only the bands a source confirmed are listed; the network may run others too.
An eSIM can only use Sure if your phone supports at least one band in this table. Before you fly, open your model's spec page on the maker's site and compare its LTE and 5G band lists.
Who licenses Sure
Mobile networks in Guernsey are licensed, and their spectrum assigned, by the Channel Islands Competition and Regulatory Authorities (Guernsey Competition and Regulatory Authority) (CICRA). The bands above are the ones it allocates. A problem with the local network's own service goes to the operator first; a problem with your eSIM plan comes to us.
The plans on our shelf that name Sure
From the supplier record behind each package, 5 of the 16 plans we currently sell for Guernsey declare Sure as a network the profile can reach, at 4G. The figure comes from the same catalogue that prices the plan pages, and it moves when the supplier revises the record.
A plan naming Sure means the network sits in the list the profile may choose from. It does not mean your handset will stay on it. The priority order is the supplier's, and the signal where you stand decides.
Sure beside the other networks in Guernsey
| Network | LTE bands | 5G bands |
|---|---|---|
| Sure | B20, B3, B7 | Not verified |
| JT (Jersey Telecom) | B20, B3, B7 | n28, n78 |
A band shared across networks is one a single phone can use on all of them.
Why plans do not name a fixed network
Nearly every travel eSIM is a roaming product: the profile picks a network by an order the supplier sets, not by the buyer. If Sure is weak where you are, try selecting JT (Jersey Telecom) manually in the network settings, and keep data roaming on for the eSIM profile.
FAQ
Will my eSIM definitely connect to Sure?+
5 of our plans name Sure as reachable, but that is not a guarantee. Travel plans run over roaming agreements, so the network depends on the supplier behind the plan, your device and where you are.
Which bands does my phone need for Sure?+
At least one of these, LTE: B20, B3, B7. Your phone's band list is on the maker's spec page for your model, under "Cellular" or "Network".
Does Sure run 5G, and will my plan get it?+
We could not confirm Sure's 5G status from an official source. Our plans that reach this network list 4G.
How do I see which network I am on?+
Check the carrier name at the top of the screen, or open the mobile-network settings and look at the operator list. If signal is poor, try selecting a network manually instead of automatic, but only one your plan actually supports.
Sources
- Sure Guernsey mobile network upgrade — Sure, October 11, 2026
- Sure homepage — Sure, October 11, 2026
- Wikipedia: Mobile network codes in ITU region 2xx (Europe) — Wikipedia, October 11, 2026
- CICRA 5G spectrum award case (search result) — CICRA, October 11, 2026
About the author
Bob Kanokphon Thongdee
- Co-founder of eSIMonline.asia
- More than 7 years in online marketing
- Founder of Cojourney Visa and Cojourney Travel
Share this page
Instagram and TikTok have no web share button, so we open your phone's share sheet or copy the link instead.
Related
eSIM plans for Guernsey
Ranked by our value score. Each plan page lists the networks its supplier declares.
Fixed
Guernsey 5GB 30 days
Sure
- Data
- 5GB
- Validity
- 30 days
- Hotspot
- Yes
- Technology
- 3G / 4G
- Hotspot
- Top-up ready
- Long stay
Validity starts on first connection at the destination
- 4G only, no 5G
- One network
from$20.90$19.85
Guernsey 3GB 30 days
Sure
- Data
- 3GB
- Validity
- 30 days
- Hotspot
- Yes
- Technology
- 3G / 4G
- Hotspot
- Top-up ready
- Long stay
Validity starts on first connection at the destination
- 4G only, no 5G
- One network
from$12.90$12.25
Guernsey 3GB 15 days
Sure
- Data
- 3GB
- Validity
- 15 days
- Hotspot
- Yes
- Technology
- 3G / 4G
- Hotspot
- Top-up ready
Validity starts on first connection at the destination
- 4G only, no 5G
- One network
from$12.90$12.25
Guernsey 1GB 7 days
Sure
- Data
- 1GB
- Validity
- 7 days
- Hotspot
- Yes
- Technology
- 3G / 4G
- Hotspot
- Top-up ready
- Budget
Validity starts on first connection at the destination
- 4G only, no 5G
- One network
from$5.90$5.60