So long as you have committed to buy or won the auction for the pickup item you can message the seller and they can give you their contact details.
It's when a buyer attempts to get contact details when there has been no purchase or commitment to buy that eBay will penalise the seller for giving out contact details - a 7 day ban on any messaging will then apply to both the buyer and the seller.
It's also been said that now sellers can give their phone number on listings, but eBay is not promoting that option.
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