Service
0. Is the service anonymous or just pseudonymous?
1. What anonymity technologies are employed?
2. What transfer limits are there?
3. How many concurrent connections are allowed per account?
4. How many hops are there in a vpn connection?
5. What operating systems are supported?
6. Are smartphones supported?
7. How do you cancel service?
8. What exit countries are offered?
9. what vpn protocols are offered?
10. What makes your vpn service unique or better than others?
11. What port speed is your server on?
12. What is the maximum throughput rate?
13. Where are your servers?
Security
0. How are servers protected?
1. How is the communication protected?
2. Are their servers encrypted?
3. Are the communications encrypted?
4. Do they have key exchange?
5. Is the communication protected by perfect forward secrecy?
6. how frequently do you update your servers?
7. do you have any real security experts on staff? if so, who?
8. From whom can the VPN provider protect against?
9. Is port forwarding allowed? (bad)
10. Are they running their network on VPS/cloud servers? (bad)
11. What makes your vpn security better than others?
12. Can you protect against government surveillance?
13. How often do you switch encryption keys on the stream?
14. What is your corporate structure?
Policies
0. Refund policy?
1. Privacy policy?
2. How long have you been in business?
3. What security experts designed your network?
4. Why should I trust you?
5. Who is behind your corporation?
6. Do you log? If so, what do you log and for how long?
7. Where are you incorporated?
8. What information do you have about your customers?
9. Who administers your servers?
10. Who has access to your servers?
11. How are abuse complaints handled?
12. How are subpoenas handled?
13. How are law enforcement requests handled?
14. Have you ever cooperated with law enforcement?
15. Has any customer identity or traffic ever been compromised?
16. Do you inform your clients if a subpoena for their information is served?