Change SIM card for new SIM card for a new phone

[DonWebster]

My account is [REMOVED] and looking if I can change my existing SIM card for a new SIM free card for the I Phone 15 Pro Max, 30GB £14.99, 5G enabled.  We are looking buying at this phone from Costco.  

Existing phone no longer required. 

[Enlli]

The old SIM may work. However if it is not 5G then the best bet is to call into an O2 shop with photo ID and they will do a swap there and then

Otherwise contact O2, but they turn off the old SIM before the new arrives, so you will be without for a few days

You will need to contact O2.

Message them on Social Media. Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) 

Or phone them on 202 or 0344 809 0202 (contract) 

 *FLAGGED for account number

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[MI5]

@DonWebster 

Assume you are looking to change your tariff?

If so, you can process a sim only upgrade in your MyO2 if eligible or check offers on uswitch.

https://www.uswitch.com/mobiles/compare/sim_only_deals/o2/
Choose the deal you want
This will automatically redirect you to the O2 website
Just follow the prompts and choose the UPGRADE option
Complete the deal and nothing on your account changes except the tariff at the new cheaper cost
Payment date is the same and your next bill will be cat a cheaper rate and will be made up of the pro rata cost of your old tariff and your new tariff
The change should show in My O2 within 24 hours
Volt benefits will still apply as will possibly a 3 month extra such as Disney+