It depends. If you moved your AnyConnect licensing to 4.x then all of the license types include the Mobile device support.
Under the 3.x and earlier license types, you needed a separate "AnyConnect for Mobile" license (now end of sales).
"show activation'key" or "show version" from the ASA command line will show you what's licensed. The newer 4.x licenses will show the Mobile license active even though it wasn't purchased separately.