The SichboPhone app is essentially not-for-profit. It lets you avoid rate markups imposed by regular pre-paid mobile plans.

Since SichboPhone is a Wifi-only phone/SMS app, we're able to route your calls and texts through a telco provider at wholesale cost with no markup. We make no profit from your calling activity. The only thing we ask in return is a €1/month stipend which helps to keep our servers online.

You can check out the current wholesale rates here.

 

SichboPhone looks like this on PCs.
SichboPhone was built so that you can have a real working mobile number for texting and voice on your Windows 10 device for less than €2/month (depending on your number's country) and with calling rates that are fractions of a cent per minute in most cases.
Download for Windows 10