Additional sim only

[KL01]

What deals could I get for an additional sim only for a family member 

[jonsie]

Use 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 at the 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+

[MI5]

@KL01 

You get multisave discounts on additional sims. 

Guide: O2 Open & Friends and Family discounts - How to sign up