I’ve been using Google Voice since it was invitation-only [/hunblebrag], us calls are free and international calls are pretty reasonable (Calling Rates); I call friends in Australia for $0.01/min.
If you use the Voice app (or third-part apps) on your iPad or Mac web browser, it does not relay your call to your cell, and US calls are absolutely free.
Texts are also free, work internationally, and with every bank and 2FA I’ve encountered.
You can port existing numbers in, and I’m pretty sure Federal law on ports says you should be able to port your Skype number. Of course you can also port out if you decide the service is not for you.
Combine Voice with an Ooma or ObiHai box, and you can use existing wiring of your house or business to continue using traditional corded telephones, and, bonus: it will transfer fax calls to your ancient machines.
Of course, if you install the app on your phone (iOS or Android), it acts as a voip, and rings your line. You can choose whether or not to have it forward to your cell, to your office number, your MIL’s landline, etc.
And if that really appeals to you, I want to plug an awesome iOS app (iPhone, iPad and Touch), called GV Connect (https://gvconnect.com/), which, amongst a hundred other awesome features, allows you to geofence your location-enabled device, such that calls only get forwarded to a given number based on your current location. I use this everyday; if I go to work, my GV number “follows me” there automatically; when I leave, it switches back to my iPhone (and iPad and Macs), until I reach another destination where I prefer a regular phone over my iPhone. (I’m disabled and I prefer to use a headset phone; I know, AirPods, Jabra, blah blah).
I once wrote an entire article for tidbits about this awesome app, but life got difficult and I never submitted it.
GV voicemail is bottomless, and transcripts are usually pretty good if the caller speaks reasonably clearly. I recently retrieved several voicemail from 2008.
Call quality is excellent, but does require a decent Internet connection to not get compressed into garble.
I could go on and on describing both service and app(s) features, but I think this is already lengthy.
HTH
Cheers