If information on the relevant features of mobile phones to be purchased is not gathered during the planning phase, urgently required functions may not be available. If specific mobile phone standards are not supported, the devices will not be usable in certain countries. In the worst case, their range of functions will not correspond to the intended purposes and render the devices entirely unusable. There are often additional general conditions that must be fulfilled to enable the use of such devices. These include, for example, security features that are often not obvious at first glance, but can lead to availability and confidentiality issues when deployed.