Scam

The Hi app will use your cellular network to make calls unless you specify to only use WIFI with the "call out" feature, BUT its never actually worked for me. It gives me the error message "someone is already using this account", which makes no sense.
The "Hi Team" seems like they would be friendly, if they were actually real. One option in to utilize their chat to get help with the app, but Ive asked for help several times over the past week and a half without so much as one response.
The only "help" offered to me when I tried to research my problem was an offer to pay money for more credits. -which probably wouldnt have worked anyway!

Terrible app. Terrible service.

Suzbell about Hi - Instant Messenger