If you would like to update your current number, you can browse our live inventory to find a replacement that suits your business.
Step 1: Browse Available Numbers
Visit the ONSIM website as if you were placing a new order.
Navigate to the page where you choose your number.
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Browse the available ranges and note down the specific number you would like to secure.
Note: Do not complete a new order/checkout. Just find the number you want!
Step 2: Contact Support
Email support@onsim.uk with the following information:
The New Number: State the specific number you selected from our website.
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Action for Old Number: Confirm if you want to:
Release your old number (cancel it entirely).
Keep your old number as an additional line for inbound calls (available for £1 + VAT per month).
✨ Premium & Memorable Numbers
Looking for a "Gold" or "Memorable" number to make your business stand out?
Timeline & Completion
Processing Time: Number changes typically take up to 24 working hours to complete across the network.
Confirmation: We will send you a confirmation email as soon as the change is live.