I’ve received my SIM in the post and want to switch my old number to ID but don’t have a transaction number. It’s not clear from the welcome information on the website exactly what you’re meant to do to set up you ID mobile account and switch the number.

I’ve found out how to do it but I think there needs to be more detailed guidance for new customers. Without a welcome email, I had to sign up for an account with the ID mobile number provided then go into my account where I could see the transaction number to start the number switch process. It’s not quite as simple as the 1,2,3 shown on the website. Hope this helps others in the future.

How do I find my transaction number? I don't have a welcome email.

To enter this promotion, participants must register with the iD Mobile Community and provide an answer to the question on the corresponding topic thread: “How to use smart tech to keep your New Year resolutions on track.”

No purchase necessary.

The closing date for entries is 23:59 on 19th January 2026. One prize will be awarded: THERABODY Theragun Prime G5 Handheld Smart Percussive Therapy Device - Black.

This promotion is open to all UK residents aged over 18 years (except for employees and their families of the Promoter and their group of companies, agents (including affiliates), suppliers and anyone connected with this promotion).

Only 1 entry per person is permitted, duplicate entries will not be entered into the draw.

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One winner will be selected at random by an independent person from all correct and eligible entries received. The winner will be notified by email or by private message on the Community platform and will be asked to reply within 7 days of receipt of the notification. If the Promoter does not receive confirmation from the winner that they accept the prize by this time, the Promoter reserves the right to withdraw the offer/prize. The prize will be delivered within 30 days of acceptance.

The prize is non-transferable and non-refundable and cannot be exchanged by a winner for an alternative. The Promoter reserves the right to replace the prize with a similar value prize.

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