Why do all communication apps (whatsapp, telegra, skype) crash before i can open them?

[mamoomamoo]

I just got a second hand iphone 6s (from a trusted retailer) and for some reason all apps work apart from all communication apps (whatsapp, telegram, skype). they just crash before i can open them, I have rebooted, restarted and reinstalled apps and ios several times, still no luck...

 

[Rob Phillips]

Welcome to iMore! When you're reinstalling iOS are you doing it using recovery mode and iTunes or are you simply erasing all content and settings? Also, are you restoring from a backup or setting it up as a new device?

I recommend using recovery mode and connecting to iTunes. This will wipe your iPhone completely and then reinstall iOS. Once that process is complete set your iPhone up as a new device rather than restoring from a backup. This will give you a clean slate from a software standpoint. Install your communication apps one at a time and test before tinkering with any settings on your device.

http://www.imore.com/how-to-iphone-ipad-recovery-mode

If you're still having issues at that point then it's very likely a hardware issue.