Been out of the country for 9 years

Came to Korea with about six or so cards in my wallet, and got busy with life and watched all of them all get closed. Plans are changing and I'm moving back to the States next year. I don't have a US phone number so I"m having a tough time accessing credit reports/scores. Somehow I logged into Chase and discovered that my Vantage score is 675 (is that even legitimate?). I was expecting much lower. I tried to apply for a Chase card but I don't think went through. Any advice on steps to take to get a new card in my hands and start improving my credit? I"m sorry if I'm lacking a lot of information, I'll rectify that as quickly as I can.