[Fuzzeh]

If the item isn't full-filled by Amazon (ie my stock isn't in an amazon warehouse) then I need their address details and phone number (for the courier) to ship the item.

Dealing with Amazon, as a seller, can be a terrible experience. Using their full-fillment service more so. They don't check returns so the next customer night get only part of a product, or in lots of cases a bogus product when a buyer fills the box with other cheap junk.

[kadoban]

Do you actually need a phone number to ship? I've literally never had a shipping company call or text me, can't imagine they require phone numbers.

[Fuzzeh]

Courier companies DPD/FedEx/UPS request one. Sometimes it speeds up the process is a location is difficult to find.

With DPD it's certainly down to the individual driver because they're calling on their own phone ( many just wont because of thst).