  More and more observational studies exploit the achievements of mobile
technology to ease the overall implementation procedure. Many strategies like
digital phenotyping, ecological momentary assessments or mobile crowdsensing
are used in this context. Recently, an increasing number of intervention
studies makes use of mobile technology as well. For the chronic disorder
tinnitus, only few long-running intervention studies exist, which use mobile
technology in a larger setting. Tinnitus is characterized by its heterogeneous
patient's symptom profiles, which complicates the development of general
treatments. In the UNITI project, researchers from different European countries
try to unify existing treatments and interventions to cope with this
heterogeneity. One study arm (UNITI Mobile) exploits mobile technology to
investigate newly implemented interventions types, especially within the
pan-European setting. The goals are to learn more about the validity and
usefulness of mobile technology in this context. Furthermore, differences among
the countries shall be investigated. Practically, two native intervention apps
have been developed for UNITI and the mobile study arm, which pose features not
presented so far in other apps of the authors. Along the implementation
procedure, it is discussed whether these features might leverage similar types
of studies in future. Since instruments like the mHealth evidence reporting and
assessment checklist (mERA), developed by the WHO mHealth technical evidence
review group, indicate that aspects shown for UNITI Mobile are important in the
context of health interventions using mobile phones, our findings may be of a
more general interest and are therefore being discussed in the work at hand.
