Convertible mobile device

1. Convertible mobile device

1.1 is a front and right side perspective view of a convertible mobile device embodying our new design in a rollator configuration;

1.2 is a right side elevation view thereof;

1.3 is a left side elevation view thereof;

1.4 is a rear elevation view thereof;

1.5 is a front elevation view thereof;

1.6 is a top plan view thereof;

1.7 is a front and right side perspective view thereof in a transport chair configuration;

1.8 is a right side elevation view thereof in a transport chair configuration;

1.9 is a left side elevation view thereof in a transport chair configuration;

1.10 is a rear elevation view thereof in a transport chair configuration;

1.11 is a front elevation view thereof in a transport chair configuration; and

1.12 is a top plan view thereof in a transport chair configuration.

The broken lines in the drawings illustrate portions of the convertible mobile device that form no part of the claimed design.