Meanwhile, WhatsApp's downloads fell by 35 per cent over the January 6 to January 10 time-period, with 1.3 million new downloads.

Between January 1 to January 5, WhatsApp had clocked 2 million new downloads.

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The surge came as users questioned the upcoming WhatsApp Terms of Service and privacy policy, triggering a nationwide debate.

The rush to join Signal was so high that it led to overload on its servers.

"Verification codes are currently delayed across several providers because so many new people are trying to join Signal right now (we can barely register our excitement). We are working with carriers to resolve this as quickly as possible. Hang in there," Signal had tweeted.

The encrypted messaging service also climbed to the top spot in the free apps category of the App Store in multiple countries, including India.

The official Twitter handle of Signal shared a screenshot, showing it placed above WhatsApp at the top spot in India.

"Look what you have done," it tweeted.

Along with India, it became the top downloaded app in Germany, France, Austria, Finland, Hong Kong, and Switzerland as well.

Signal earlier saw a significant surge in new users signing up for its platform after Tesla CEO Elon Musk tweeted to his 41.5 million followers to use Signal and apparently shun WhatsApp.

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