Bitcoin Miner is a very time sensitive item and UPS requires a telephone number to ship the package, so when there is any issue arise during the delivery time such as the driver can't find your house or the business, they can call you and ask you what to do or how to find you to deliver the box.
Just tried to order two with BTC to the US. Couldn't! Appears to require I enter a mobile phone number, something I neither have nor need/want. What is this shit?
International shipping requires that there be a contact number that the recipient be available if there is an issue during shipping. You should not need a mobile number specifically. Just enter you home or business number in all the phone fields. I regularly have things delivered to the US with out issue with a mobile or home/business number.