How to cancel second plan

[JJ17]

Hi, I have 2 plans, relating to 2 different phones. 1 is sim.only. I pay for both plans by direct debit. I now want to cancel the sim only plan. How do I go about this? Is there a number I can call to speak to someone.  Thanks 

[MZone]

Contact Customer Service here

[JonathanB]

Hi @JJ17,

Here's some more info on leaving and switching from Three which you may find helpful. You'll find all the ways to get in touch in the other link @MZone shared.

Thanks,
Jonathan