It's a risky thing to do and i wouldn't honestly do such thing even for a decent amount of money ..
You should look for websites that offer such services or get a number on Skype , use a vpn when using skype and it should be fine .
Sim card in the US can be bought without an identity card. It costs $ 10 + $ 20 for the first month of service. This is quite official, no illegalities. Why you said that is risky?
I downloaded VPN, switch on it. Bought Skype number, go on my PayPal, and tried to add my Skype number, but it is the same problem - «it looks like this number isn’t registered in your name paypal»