Viber messages not being read even though it shows delivered

Ndwitha wrote:

Hi, I have been sending Viber messages to someone who travelled to Malaysia but they take long to respond claiming that there’s poor wifi connection even though from my end it shows that the Viber messages have been delivered. I just want to know what could be the problem?

Sorry this has nothing to do with Apple or iPhone, but with Viber.

Suggest you contact Viber directly or look at their support site.