Lots of problems – Hi - Instant Messenger Review

I installed Hi twice, each time it works absolutely fine at first, but after two or three days whenever I've wanted to use it, it asks me my phone number and my password, I can not make voice calls, I can not neither add anyone nor accept any requests, so I just stopped using Hi and get back to Tango and whatsapp!
Review by Lena.as on Hi - Instant Messenger.