A large variety of security tools exist for Smartphones, to help their owners to secure the
phones and prevent unauthorised others from accessing their data and services. These range
from screen locks to antivirus software to password managers. Yet many Smartphone owners
do not use these tools despite their being free and easy to use. We were interested in exploring
this apparent anomaly. A number of researchers have applied existing models of behaviour
from other disciplines to try to understand these kinds of behaviours in a security context, and
a great deal of research has examined adoption of screen locking mechanisms. We review the
proposed models and consider how they might fail to describe adoption behaviours. We then
present the Integrated Model of Behaviour Prediction (IMBP), a richer model than the ones
tested thus far. We consider the kinds of factors that could be incorporated into this model in
order to understand Smartphone owner adoption, or rejection, of security tools. The model
seems promising, based on existing literature, and we plan to test its efficacy in future studies