To my understanding the product you list just provides you with the ASA5505 unit with Security Plus license. This essentially means that it doesnt have the same kind of restrictions as the Base License model. (Your product provides for example 20 Vlan support, Trunking Support, Unlimited Users, Failover support, etc)
My understanding is that if you want to use AnyConnect Client and Mobile devices then you would need AnyConnect Essentials license and AnyConnect Mobile License also. The other option is the Premium license which difference is to my undertanding that it also supports the Clientless SSL VPN.
Here is some information about the AnyConnect licensing (non Cisco site)
One thing to notice also is that the AnyConnect Essentials would only support the AnyConnect Client connections and not the Clientless SSL VPN.
Here is one quote from Cisco documentation
Q. How can I receive the AnyConnect Mobile license for the ASA?
A. The Mobile license is a fixed license on top of the existing number of licensed Secure Socket Layer (SSL) users. It can be used either with a Premium SSL VPN license or an AnyConnect Essentials license. To order the AnyConnect Mobile license for an existing unit with an SSL license, the part number is L-ASA-AC-M-55XX= (XX=05,10,20,40,50,80 depending on the model). This Mobile license can also be added as an option for new device purchases (ASA-AC-M-55XX). To order the AnyConnect Mobile license for an existing unit, contact your Cisco reseller. For an evaluation license for devices that have Essentials or Premium licenses, refer to Product License Registration for AnyConnect Mobile (registered customers only) . If you have specific questions on Mobile license requirements, send an e-mail to email@example.com.