Android app developer details challenges of messaging unsaved phone numbers

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A developer has outlined the technical challenges of messaging contacts not saved in a phone's address book. Common issues include numbers arriving in various formats and the need to correctly interpret international dialing codes. The developer advises using a maintained phone-number library to handle the complex, country-specific rules. Their own app, QuickDial, fills the message field but requires the user to manually press send to prevent errors. The app also uses a narrowly configured accessibility service to facilitate calls from within chat windows.

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