Our standard bundles are designed for UK-wide usage. Whether you are at home or travelling abroad, here is everything you need to know about calling destinations outside of the UK and making local calls while roaming.
⚠️ Important: Local Calling While Roaming
If you are travelling abroad (roaming), you will not be able to make calls to local numbers within that country (e.g., calling a local taxi or restaurant in Spain while you are in Spain) unless you have International Calling enabled on your account.
Even though you are physically in that country, the network treats a call to a non-UK number as an international connection. You must follow the steps below to unlock this capability.
1. Are International Calls Included?
No. Calls to any non-UK numbers (including local numbers when you are roaming) are not included in our standard minutes and SMS bundles. These calls are charged at a per-minute rate based on the destination country.
2. Why are International Calls Blocked?
By default, international calling is blocked on all new accounts. We do this as a security measure to protect our customers from "bill shock" due to accidental high charges or fraudulent activity.
3. How to Enable International & Local Roaming Calls
If you need to make international calls from the UK, or local calls while roaming, you must request to have this restriction lifted. This requires a formal review by our team:
Required Documentation: You must complete the International Calling Request Form found at the bottom of this guide.
Approval Process: Once completed, please return the form to support@onsim.uk.
Account Review: Our accounts team will review your application to determine if the restriction can be lifted for your account.
Requesting a Rate Quote
International rates vary significantly by country. If you would like to know the cost of calling a specific destination:
Email our support team at support@onsim.uk.
Provide the name of the country and, if possible, the area code you wish to call.
Our team will provide you with the current per-minute rate.