1.Yes you can pick your number. Just enter in any zip code and will pull up a list of numbers with that area code you can choose from.
2.I don't know about the options if you chose not to get GVN (google voice number) as i chose to get it, and you can only choose once and it can't be changed so choose wisely.
3. SMS is free.
4. You give out your GVN. Right now I only have my cell phone set up to GVN. If someone calls my GVN it rings to my cell and I can answer. If their not in contacts and it's first time they call, they will have to record name, and then when you answer you have options...
1. answer
2. send straight to voice mail
3. send straight to voice mail and listen in while they talk
i think theres one more
5. With google voice app, theres an option where you can always use google voice when placing a call from cell phone, never using or always asking.
I have it set as always ask so whenever i send a text message or place a call it asks which number i want to show up.
Nice feature. I can send text message from my phone with GVN or regualar number and same with phone. So you can pick which number shows up to your friends.