When the person is left alone, access to a telephone is important. Land lines in some geographical areas are connected with emergency services with the address of the caller posted on each service's screen. Dialing 911, 000 or 999 will bring help if the person can reach the phone.
Portable alarm buttons that people can wear and notify services if the person is unconscious are currently available but expensive. Portable buttons that require being conscious to push the button are not as expensive.
Non-emergency telephone use depends on what telephone technology the person is accustomed to using. Familiar phones and numbers are often used within the person's habitual pattern of performance. People operating within ACL 4 Low may have a reduced need to initiate contact with other people and do not carry on chatty conversations, as a rule.
Within ACL 4.4, the person might be able to learn to use a new cell or smart phone with repetitive training. These phones could protect them if they get lost in the community when they are able to recognize that they are lost and can initiate a call for help. Below ACL 4.4, they are less apt to use a phone if they have one with them, but a stranger or police officer might ask for it and place the call for them.