SSH via Internet

I can connect to my ssh server via my local wifi in my house. Now say I go to town away from my home, can I still connect to my ssh server from there thru the internet, and is entering the login info different than connecting at my home? I probably will connect from my Android phone using Andftp app. In other words, can I still connect using the same login info I use when I'm home, or do I have to login different when I'm away from home?

Thanks.:)