WhatsApp for Samsung Galaxy C5

First check that the proximity sensor isn't being covered, since holding the phone near your ear automatically switches playback to the earpiece instead of the loudspeaker. Wipe the top of the screen near the front camera, then play the message while the phone sits flat on a table; if it's still silent, go to Settings > Sounds and vibration > Volume and raise the Media slider, and confirm Bluetooth is off so audio isn't being routed to a paired car or earbuds. As a last step, clear WhatsApp's cache via Settings > Apps > WhatsApp > Storage > Clear cache and reopen the chat. See how others solved this on Reddit

Use WhatsApp's built-in 'Move to Android' transfer. Connect the two phones with a USB-C-to-Lightning cable, then start WhatsApp setup on the Galaxy C5: when prompted, scan the QR code that WhatsApp shows on the Android screen using the iPhone's WhatsApp. You must sign in to WhatsApp on the C5 with the same phone number for the history to import. (Samsung Smart Switch handles other data like photos and contacts, but the WhatsApp chat transfer runs through WhatsApp's own flow, not Smart Switch.) See how others solved this on Reddit

Open Settings > Notifications > Do not disturb and either turn it off or, under 'App notifications' (or 'Apps' exceptions), add WhatsApp as an allowed exception so its alerts break through. If you only want calls but not message popups, you can instead allow calls from your contacts while leaving other notifications silenced, and double-check that WhatsApp itself isn't muted under Settings > Apps > WhatsApp > Notifications. See how others solved this on Reddit

WhatsApp still runs on the C5, but to keep it responsive go to Settings > Apps > WhatsApp > Storage and clear the cache periodically, and turn off auto-download of photos and videos in WhatsApp > Settings > Storage and data so the chat list stays light. Keeping only WhatsApp and a couple of essential apps installed, plus using Settings > Battery and device care to free up memory, makes the older hardware much more usable day to day. See how others solved this on Reddit

On Android your WhatsApp backup lives in Google Drive, not iCloud, so open WhatsApp > Settings > Chats > Chat backup, sign in with a Google account, and set a backup frequency to protect your history. Note that an iCloud WhatsApp backup cannot be restored on Android directly, so you should do the one-time Move to Android transfer first and then rely on Google Drive going forward. See how others solved this on Reddit

WhatsApp needs a working data connection, so confirm mobile data and data roaming are enabled under Settings > Connections > Mobile networks, or simply join a local Wi-Fi network. Also check that your Galaxy C5 supports the carrier's bands in that region; if calls drop, set the preferred network type in Settings > Connections > Mobile networks > Network mode and restart the phone so WhatsApp re-registers on the new network. See how others solved this on Reddit