Useful Info
Frequently Asked Questions
What are Prepaid Travel SIM Cards?
How to keep track of your data usage from your phone settings
How to make calls/texts back home while you travel
How to turn on Data Roaming
How to change your APN settings
SIM Activation
Policies
Money- Back Guarantee
If your device is locked overseas
Returns Policy
What if my SIM doesn't arrive before I leave?
Shipping & Delivery
Asia SIM & eSIM Guides
Asia SIM Card 6GB | Data-Only | 15 Days
China & Hong Kong SIM Card 5GB | Data-Only | 15 Days
China & Hong Kong SIM Card 6GB | Data-Only | 30 Days
Indonesia SIM Card 6GB | Data-Only | 12 Days
Indonesia SIM Card 10GB | Data-Only | 30 Days
Japan SIM Card 6GB | Data-Only | 12 Days
Japan SIM Card 10GB | Data-Only | 30 Days
South East Asia SIM Card 6GB | Data-Only | 12 Days
South East Asia SIM Card 10GB | Data-Only | 30 Days
Thailand SIM Card 15GB | Data-Only | 30 Days
eSIM Hong Kong 20GB | Data-Only | 30 Days
eSIM Hong Kong 25GB | Data-Only | 90 Days
eSIM Indonesia 10GB | Data-Only | 30 Days
eSIM Indonesia 6GB | Data-Only | 12 Days
eSIM Japan SIM Card 10GB | Data-Only | 30 Days
eSIM Japan 6GB | Data-Only | 12 Days
eSIM South East Asia 10GB | Data-Only | 30 Days
eSIM South East Asia 6GB | Data-Only | 12 Days
eSIM Thailand 15GB | Data-Only | 30 Days
Europe & UK SIM & eSIM Guides
Europe & UK SIM Card | 71 Countries | 10GB | 30 Days
Europe & UK SIM Card 71 Countries | 12GB | 30 Days
Europe & UK 19GB | 28 day | Movistar
UK SIM Card 25GB, 50GB & Unlimited | 30 Days
Europe & UK 37GB Data-Only| 28 day | Vodafone ES
eSIM Europe & UK Data-Only | 41 Countries | 10GB | 30 Days
eSIM Europe & UK Travel- BT| 15GB | 15 Days
eSIM Europe & UK Travel- BT| 30GB | 30 Days
eSIM Europe & UK Data-Only | 35 Countries
Explorer SIM Guide
Troubleshooting
Start here for Troubleshooting
My data isn't working
I keep getting messages telling me to top-up
I've run out of data, how do I top-up?
Explorer Travel SIM Card | 71 Countries | Data-Only | 12GB | 365 Days
Middle East SIM Guide
New Zealand & Fiji SIM & eSIM Guides
Fiji SIM Card 6GB | Data-Only | 15 Days
eSIM New Zealand SIM 3GB &10GB | 30 Days
New Zealand SIM Card 2.5GB, 10GB & Unlimited Data, Calls & Texts | 30 Days
Tourist SIM Guide
South America SIM Guide
USA, Canada & Mexico SIM SIM & eSIM Guides
USA SIM Card Unlimited 30 Days | T-Mobile
USA SIM Card 6GB, 15GB & Unlimited Data | 30 Days | Ultra Mobile
USA & Canada SIM Card 3GB | Data-Only | 30 Days
USA, Canada & Mexico SIM Card 6GB | Data-Only | 15 Days
USA, Canada & Mexico SIM 15GB 30 Days | AT&T
USA Unlimited & Canada & Mexico 25GB- 30 Days | AT&T
USA eSIM Unlimited 30 Days | T-Mobile
eSIM Information
- All Categories
- Explorer SIM Guide
- Troubleshooting
- Start here for Troubleshooting
Start here for Troubleshooting
Updated
by Supriti
Sometimes SIMs can take a little bit of fiddling around to get going! This is completely normal and easy to do.
Here are the first thing you want to check before you start troubleshooting:
Are you in one of the 71 countries that the SIM works in?
You can find the list here.
Have you turned on Data Roaming and restarted your phone?
Here's how to turn on data roaming if you're not sure!
Have you checked your APN settings?
Make sure you've changed your APN settings to "three.co.uk"