I know there are already multiple threads on this topic, as well as the fallout from eBay's current policies, but it became clear to me today exactly how you can safely provide a phone number to buyers (if you're a store holder) and I thought having a post here might be useful.
Apparently it's been available for a few months, too. 
(Apologies if this has been mentioned before and I missed it, of course)
If you go to My eBay > Account > Manage communication with buyers, twoards the end will be this:
If you edit that to say yes, you can enter a customer contact number.
Spoiler
This is a copy / paste of the info shown on the eBay info page for this feature: "From September 2017 you won’t be able to include contact information, i.e. phone numbers, email addresses or social media profiles, in item descriptions, images, eBay Stores or seller profiles.
Buyers and sellers should always use eBay messaging tools, such as My Messages or Best Offer, to communicate with each other. Sharing contact information in listings often leads to transactions being taken off eBay. This is against our policies, and limits our ability to protect you in case something goes wrong.
We know that many sellers offer telephone support as part of providing great customer service. From mid-2017, if you’re an eBay Store subscriber or list in the Motor Vehicles category, you’ll be able to indicate whether or not you’d like us to share your customer service phone number with buyers via the Ask a question link."
https://sellercentre.ebay.com.au/SR17-1/Contact-Links
Buyers and sellers should always use eBay messaging tools, such as My Messages or Best Offer, to communicate with each other. Sharing contact information in listings often leads to transactions being taken off eBay. This is against our policies, and limits our ability to protect you in case something goes wrong.
We know that many sellers offer telephone support as part of providing great customer service. From mid-2017, if you’re an eBay Store subscriber or list in the Motor Vehicles category, you’ll be able to indicate whether or not you’d like us to share your customer service phone number with buyers via the Ask a question link."
https://sellercentre.ebay.com.au/SR17-1/Contact-Links
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@digital*ghostwrote:I know there are already multiple threads on this topic, as well as the fallout from eBay's current policies, but it became clear to me today exactly how you can safely provide a phone number to buyers (if you're a store holder) and I thought having a post here might be useful.
Apparently it's been available for a few months, too.
If you go to My eBay > Account > Manage communication with buyers, twoards the end will be this:
If you edit that to say yes, you can enter a customer contact number.
SpoilerThis is a copy / paste of the info shown on the eBay info page for this feature: "From September 2017 you won’t be able to include contact information, i.e. phone numbers, email addresses or social media profiles, in item descriptions, images, eBay Stores or seller profiles.
Buyers and sellers should always use eBay messaging tools, such as My Messages or Best Offer, to communicate with each other. Sharing contact information in listings often leads to transactions being taken off eBay. This is against our policies, and limits our ability to protect you in case something goes wrong.
We know that many sellers offer telephone support as part of providing great customer service. From mid-2017, if you’re an eBay Store subscriber or list in the Motor Vehicles category, you’ll be able to indicate whether or not you’d like us to share your customer service phone number with buyers via the Ask a question link."
https://sellercentre.ebay.com.au/SR17-1/Contact-Links
Just as a follow up to this, in today's seller release email there's an article that takes you to this page:
https://sellercentre.ebay.com.au/SU18-1/eBay-Stores
where it says this:
As a reminder, business and personal contact information, such as email addresses, phone numbers, and links to sites off-eBay, is not permitted anywhere on eBay including Store pages and other member-created content. If you wish to provide your customer service phone number for post-transaction support, you can use one of eBay's features that make your customer service phone number available when a buyer uses "Contact Seller." You can opt into the feature within "Manage communication with buyers" in your account settings.
I've highlighted the most important bits for those who can't be bothered reading the whole thing very carefully. The way to put your phone number for people who've already bought from you is obviously the same as described by digi.
I am not a store holder but that option seems to be available to me.
