Bosnia and Herzegovina: Send the pickup pin and destination, then wait for an explicit confirmation. A delivered message does not mean a taxi has been assigned.
Bulgaria: Install it when a Bulgarian contact uses it, but ask which channel they prefer. Activate it before travel while your main number can receive a code.
Greece: Install it only when a Greek contact specifically uses Viber. Keep phone, SMS and email fallbacks for urgent coordination.
Montenegro: Use only a number from the booking or provider's official listing, and confirm the vehicle, total fare and payment method in writing.
North Macedonia: Use it when a business publishes a Viber number. Verify payment requests elsewhere and keep ordinary calling as a backup.
Myanmar: Confirm the contact's preferred channel before arrival and save a voice-call backup. Network blocks and shutdowns can affect any messenger.
Maldives: Do not install it by default. Add it when your guesthouse or a verified operator specifically asks to continue on Viber.
Nepal: Install it when a verified contact prefers it. Keep SMS and phone numbers as backups for weak data coverage.
Philippines: Ask for the exact Viber number through a trusted source. Save an ordinary voice-call number because neither app is guaranteed during an outage.
Serbia: Useful but not universally required. Confirm the recipient before sending personal documents, and use phone emergency numbers rather than chat.
Ukraine: Do not install it merely because it is popular. Use the booking channel first, verify unfamiliar contacts and never send an emergency request only by chat.
