Have you been taking pictures? Videos? What apps have you installed lately? Have you exported contacts lately?

Hi, supriyobhowmick!

You may be able to clear the cache partition of your phone by accessing the recovery menu by pressing and holding POWER + VOLUME UP, but I'm not sure if that is what affects Application Storage.

Application Storage seems to drop by itself because some developer write their apps to store additional information locally. That is normal. If your application storage does reach 0 (which should really only happen if you install too many apps; as far as I know, apps have access to 5MB of local storage. Most apps do not use anywhere near that amount of storage).

I hope that helps you! Please feel free to post back with more questions.

@Andrew: I have taken only 1 picture, which I stored on external SD card. Although some pics received on WhatsApp(through ConnectA2) are stored in default location, which I can't seem to have access to. I don't have any videos. I have ConnectA2, facebook, Gmail, File Manager and 2048 apps. Other than these I have some pre-installed apps which can't be deleted. I haven't exported contacts ever.

@Epicaleb: POWER+VOLUME UP doesn't work on my device. What should I do if app storage reaches 0?

My device is Intex Cloud FX.

It is highly doubtful that your app storage will reach 0 unless you install too many apps, but if it does, your only option will be to delete apps. It should not hurt your phone in any way.