I have paid for the unlock key for freephone line. I am using LG G4 (unlocked from koodo) which runs Android 6. It does NOT have native SIP dialer.
I am currently experimenting with Zoiper.
On wifi, I can dial/receive calls using Zoiper/Freephoneline, quality is very good.
On data, I can dial out, it works as expected. However, when I receive a call, I don't hear anything from the incoming phone, nor does the person hear me.
My questions are:
1) what SIP client is recommended on Android 6?
2) any particular setup I have to use on Zoiper to get the incoming call (on data) to work properly?
3) what are the possible causes why incoming call does not work properly on Fido data? That is, I can answer the call, so the routing does work; but I cannot hear anything or can the person calling me hear anything.