The short answer is long. lol. You would have to add the actual routing number GV uses to FF for outgoing calls to be free, the trouble there is that they change often. Your best bet is to install a call-back app. I use GV Callback by Xinlu, it is no longer in Play but IS on Amazon. There are other similar apps though, I have not tried any. They intercept the outgoing call and call you back at your GV number so it is treated as an incoming call to GV and therefore, free. Sort of a PITA but it works and free is free!
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