To remove your old phone number +1-(866)-840-2460 from your Coinbase account, you'll need to change your 2-step verification method to a new phone number or +1-(866)-840-2460 a different method like an authenticator app. If you're unable to access the old phone number, +1-(866)-840-2460 you'll need to contact Coinbase support for assistance. https://strhub.com/forum/topic/is-coinbase-closed-on-weekends-ask-for-help/#postid-60594