YouTube, Gmail, Google Maps, and other popular apps won't work on millions of phones from today because of a huge update.
Any devices using Android 2.3 will lose access to a number of applications after Monday, September 27, according to US tech giant Google.
If you try to sign in to a number of Google products after today, you will likely get a username and password errors report WalesOnline.
Other apps being halted include Google Play Store and Google Calendar - but in total there are a whole host of Google apps.
Android 2.3 launched in December 2010 but Google will now withdraw support for it.
The move is "part of ongoing efforts to keep our users safe", according to the Silicon Valley tech company.
Owners of the following phones are affected, including the Sony Xperia Advance and the Lenovo K800.
Owners of the Sony Xperia Go, Vodafone Smart II, Samsung Galaxy S2, Sony Xperia P, LG Spectrum, and Sony Xperia S are also impacted.
Device owners using LG Prada 3.0, HTC Velocity, HTC Evo 4G, Motorola Fire, and Motorola XT532 phones are also told they cannot update.
It comes amid reports WhatsApp will also stop working on a swathe of Android and Apple devices later this year.
Google said: "As part of our ongoing efforts to keep our users safe, Google will no longer allow sign-in on Android devices that run Android 2.3.7 or lower starting September 27, 2021.
"You will be able to sign into your account with a newer Android version (3.0 or newer). If your device has the ability to update to a newer Android version (3.0+), we advise you to do so."
