WhatsApp, the online messaging service, went offline on Wednesday May 3, frustrating millions of users worldwide.

The Facebook-owned service went down on Wednesday evening, affecting users in Cameroon, the Zambia, UK, US, Australia and Brazil, among other countries. It returned at around 11.20pm.

It is still not clear what caused the breakdown with the hugely popular online messaging service however a spokesman for WhatsApp reportedly said the application is planning a major update.

In Cameroon, many users of the app who could not open the app, fumed over Twitter demanding why they can’t connect to its servers, making it impossible to send or receive messages.

Some English speaking Cameroonians thought it was another internet censorship given government’s recent internet shut down for 93 days in Anglophone Cameroon.

 It also left users longing for simpler times, when people used old simple Nokia phones.

Whatsapp has swiftly grown from a small startup to one of the most popular messaging apps in the world, with over one billion users. There are a number of updates in the works. Among them is one that could soon let users recall messages sent within five minutes, offering a way to prevent embarrassment over mistaken texts.

The sought after feature will allow users to “unsend” messages, removing them from a receiver’s phone before they have had a chance to read them.