The common issue now is the phone started to hang and work slow. Also, phones were getting dialled automatically in many cases. Apart from these no other safety issues have been found with this app. Tutuapp is safe but apps on tutuapp may not be safe.
Somehow, as tutu application is a third part application. When you install any application from it, the specific application requires your personal data, which means that you need to take a look at their terms and conditions. Otherwise the application is safe.
Since the app is originated in China, it is an alternative to Google’s Play Store, it is really weired demand access to make call, send text and looking at your call logs, this kind makes it bit unsafe.
I’d say that the lesser number of apps you depend on, the better. I am mostly against using third-party apps. Many of them cause security issues and lead to the compromising of personal data. Well, that’s just my personal opinion.
While these apps are enticing, loading any software outside of the Apple App Store is very risky! Best is to stick with real apps off of the Apps Store or use a second iPhone which you don’t have any personal info on so if its compromised you haven’t lost anything.