You can get phone numbers for certain countries to receive SMS messages, and you can only get these numbers for a certain period, but I don't know if there is a service that sells the numbers.

If you intend to rent a number for a short period, you can try http://smspva.com/arenda.html  and you must know:

• Max guarantee period for the rent - 90 days.
• We are recommend to use private proxy, clear cache and cookie of browser when you create accounts using numbers.

Source: http://smspva.com/arenda.html

You have about 90 days to use a phone number according to the above data, but privacy has a price as you may lose the right to help if you want to use the number for more than that period.