Are these apps intended for use only by kids or do they fundamentally misunderstand what a contacts list is? Due to the enormous volume of spam sent to any person who has ever owned property or voted in the United States, the only real solution is never answer a phone call from an unknown number, and consequently put every business and contractor you ever expect to hear from into your contacts list. These are not actually my friends. Many of them are organizational numbers, many are numbers I have not called or been called from in 15 years, many of them likely long ago went out of service.