drfyzziks, If you want secure messaging between #iPhones and #Android phones, don’t use #Beeper. Seriously, don’t do it. There are other, better and more reliable options out there (cough Signal cough).
I've used Beeper (w/a test Apple account) & liked it. However after the recent kerfuffle around Beeper Mini, I deleted the app b/c I didn't like how Beeper handled things (adding devices to my iCloud account & unregistering a phone number, both w/o my permission)
Glad it was a test account / number.