O2 SMS Only eSIM
Two Factor Authentication by SMS is now the industry-standard method of providing secure login for many services.
Have you ever been unable to access your bank account while travelling? Our SMS-only product provides you with a private and secure UK telephone number as a handy eSIM service that you can load into your phone as a second line and still receive the codes at home, and indeed anywhere in the world. Reliability is key for SMS Two Factor Authentication and being an O2 service, the delivery is pretty much guaranteed.
The number and service can be yours for life for just US$ 6.00 per month with no additional charges whatsoever. You can even port your existing UK number in with a PAC code.
You can receive and install this unique eSIM service within 5 minutes and it will be fully activated on receipt. Note that this is inbound SMS only with no calls or data supported.
Updated: June 2026
Cook Islands eSIM guide: coverage, local SIMs and SMS access
If you're comparing an eSIM Cook Islands option with a local SIM, the main thing to know is that coverage is concentrated on Rarotonga and Aitutaki. Around Avarua, Muri and the airport road, signal is usually much better than on remote motu or quieter outer islands. If your trip includes beach days, lagoon tours or island hopping, plan for patchier service once you leave the main settlements.
For visitors who need bank codes, login verification or a secure second number, the O2 SMS Only GLOBAL eSIM is a useful backup. It is not a data plan, but it does let you receive incoming SMS while you travel.
Cook Islands mobile options compared
Practical options for travellers in the Cook Islands
| Option |
Best for |
Coverage |
eSIM support |
Typical cost |
Notes |
| Vodafone Cook Islands prepaid SIM |
Data, local calls and maps |
Best on Rarotonga; decent in Aitutaki; weaker outside main roads and villages |
Usually physical SIM first for tourists |
Starter packs often around NZ$20-50 plus top-ups |
Bring your passport and buy top-ups locally |
| Home carrier roaming |
Short stays with no setup |
Depends on your roaming agreement |
Yes, if your home plan supports roaming |
Usually the most expensive option |
Convenient, but not the best value for longer trips |
| O2 SMS Only GLOBAL eSIM |
Incoming SMS and 2FA codes |
Not a data service |
Yes |
About £5 per month |
Install before departure; does not replace travel data |
What travellers should expect on arrival
- Airport SIM stock can be limited, so it is safer to buy a local SIM in Avarua or from an authorised shop rather than assuming a full airport kiosk range.
- Passport registration is commonly required for prepaid SIMs, so keep your passport handy.
- Foreign cards may work online, but smaller shops often prefer cash for top-ups.
- 4G/LTE speeds are usually fine in the main towns, but they can drop off quickly outside the busy coastal areas.
- WhatsApp, FaceTime and similar apps work well on Wi-Fi or mobile data, but you should not count on constant signal during boat trips or in more remote parts of the islands.
eSIM vs physical SIM in the Cook Islands
If you need mobile data for maps, messaging and bookings, a local physical SIM is still the most practical choice in the Cook Islands. If you mainly want to keep your UK number alive for verification texts, an eSIM Cook Islands setup with the O2 SMS Only plan is easier to prepare before you fly. Many travellers use both: a local SIM for data and a second-line eSIM for banking, delivery apps and account security.
That mix also helps on a longer South Pacific trip. If you are continuing to nearby islands, compare our New Zealand eSIM, Fiji eSIM and Samoa eSIM guides before you book your next leg.
