After an hour-long breakdown, WhatsApp services have partially been restored.
More than 27,000 user reports about the app's functionality were found on Downdetector, a website tracking platform.
While 69% of those surveyed reported issues sending messages, 24% had issues connecting to servers, and 7% had problems with the app as a whole.
A spokeswoman for Meta was quoted by the news wire agency ANI as saying, "We're aware that certain users are now having problems sending messages and we're working to restore WhatsApp for everyone as quickly as possible."
A number of significant cities, including New Delhi, Bengaluru, Kolkata, and Mumbai, were having significant problems using WhatsApp, according to the heat map on Detector. Even smaller cities like Cuttack, Surat, and Indore displayed similar issues.
The amount of reports filed on Downdetector about users being unable to communicate has increased for WhatsApp for Business, the version of the network created for businesses and organisations to conduct commercial transactions.