Hi @Jay1
If you have 2 SIMs under your ID you can unjoin the SIM from Jawwy app > more > from my device choose the number > click remove device from account.
If you have only one SIM under your account kindly contact us through support page (live Chat and Email) or social media channels Facebook and Twitter and we will be more than happy to help.
Thanks for choosing Jawwy
Ammar
