How many developers developed it?
Just myself, I hardly slept enough during building it, but it paid off :D
How much time it took?
I started in April, but started coding enf of May
You started earning?
Yes, 2 paying customers, very very minimal but that prooves the need I think
How are you advertising?
Hard, still trying to market to it
Why not people call from there phone for international call?
It's expensive; this is a cheaper option for sure.
In Canada, my provider charges 0.60cad/minute to Europe.
Voklit : 0.05$ / minute
What? VOIP.MS
Countries like Germany start at $ 0.0147 / min
voip.ms requires setting up SIP credentials and configuring a softphone (or their app). Great for technical users who want maximum control and lowest rates. Voklit is for people who wish to download an app / use the browser and start calling immediately without touching any settings.
You can do that with Google Voice for free and much lower rates. US/UK/Aus are 1 cent per minute versus 5 on your system, thats your competition.
Google voice isn't available in Canada.
Mytello is 0.05CAD / minute.
Google Voice is available everywhere with a little effort. I've used it outside of the US for over 10 years.
Even without GV there are other lower cost options. The actual (wholesale) cost of these services are around what GV charge or less, a 5+ times mark up is pretty rich.
"little effort" = friction.
Many SaaS offer are just removal of friction.