Our UK-based support team is here to help you get the most out of your OnSim service. Whether you have a technical query or need help with your account, you can reach us through the following channels.
🕒 Opening Hours
Monday – Friday: 09:00 – 17:00
Weekends & Bank Holidays: Closed
Ways to Contact Us
1. Online Portal (Recommended)
Log in to app.onsim.uk and select Support Centre from the left-hand menu.
Why use this? This is the fastest way to resolve technical issues. You can link specific call or SMS examples directly from your logs to your ticket, helping our engineers diagnose problems instantly.
2. Email Support
Send your enquiry to support@onsim.uk.
You will receive an automated reply with a Ticket ID. Please keep this ID for all future correspondence regarding that specific issue.
3. Phone Support
Call us on 0333 880 4008.
Note: For complex technical faults, our team may ask you to submit a formal ticket via the portal or email first so we have the necessary data to assist you.
4. Live Chat
Available on our website for general enquiries and sales questions.
Security Note: For account-specific or technical support, please use the Portal or Email, as we cannot verify your identity or access secure call data via Live Chat.
🌙 Outside of Office Hours
If you need help while our office is closed:
Self-Service: Browse our extensive Help Centre & Support Guides for instant answers to common setup and troubleshooting questions.
Leave a Message: You can still email support@onsim.uk or raise a ticket in the dashboard. Our team will review and respond in priority order as soon as the office reopens on the next working day.