A. 1. Check your internet connection: Ensure you have a stable Wi-Fi or mobile data connection. Try switching between Wi-Fi and mobile data to see if it improves message delivery. 2. Enable background data: Go to 'Settings' > 'Apps' > 'YoHo' > 'Data usage' and ensure 'Background data' is enabled.

B. 3. Clear app cache: As mentioned earlier, clearing the cache can help resolve issues with message delivery.