How to find out if a subscriber has WhatsApp on their phone - briefly?
To determine if a subscriber has WhatsApp installed on their phone, you can either send them a message via the app and observe if it delivers successfully or use a third-party service that checks for the presence of WhatsApp on the number.
How to find out if a subscriber has WhatsApp on their phone - in detail?
To determine whether a subscriber has WhatsApp installed on their phone, you can employ several methods that leverage the unique features and behaviors of the application.
Firstly, consider sending a message to the subscriber's phone number via WhatsApp. If the message is delivered and read, it indicates that the recipient has WhatsApp installed on their device. The delivery status will typically show one or two checkmarks if the message is sent but not yet read, and two blue checkmarks when the message is successfully delivered and read by the recipient.
Secondly, you can utilize online databases or services that provide information about phone numbers, including whether WhatsApp is active on a specific number. These services often have extensive data collected from various sources and can offer insights into the presence of WhatsApp on a subscriber's device. However, it is essential to ensure that such services comply with privacy regulations and do not infringe upon the rights of the subscriber.
Thirdly, you may attempt to initiate a voice or video call through WhatsApp. If the call connects and the subscriber answers, it confirms that they have WhatsApp installed on their phone. Additionally, if the call goes straight to voicemail or is not connected at all, it might suggest that either WhatsApp is not installed or the subscriber has chosen not to use the calling feature within the application.
Lastly, you can check the online status of the subscriber within WhatsApp. If the subscriber's profile shows an "online" status, it implies they are actively using WhatsApp on their device. Similarly, if there is a recent activity timestamp or a last seen status visible, it indicates that the subscriber has been active on WhatsApp and thus likely has the application installed.
By combining these methods, you can gather comprehensive information about whether a subscriber has WhatsApp on their phone. Each approach offers unique insights and together can provide a reliable indication of the presence of the application on the subscriber's device.