What is the bad for a real user to verify his account with a phone number? He doesn't mind since it's his true account. But for the spammer, like you, it's a big problem. A normal user won't post on fan wall more than 2-3 times a week. It won't kill itself by doing this.
Ever heard how beer and wine is made? The fermentation is really important in the process. That's the same with accounts everywhere. Thats the best way to avoid tyhos kinds of limitation.
Get 500fb profile PVA. Add 1-2 profile to each university network around usa&europe. Add a lot of them to start, like 80 the first day (you think I am crazy, but thats the way real user will do). Do this 1 to 3 days then add 10-20 freidns a day. By a week you'll be good, and not tagged as a spam.