Memory management of Android devices According to manufacturer, my phone has:


ROM-4 GB
RAM-1 GB


But when I look in my phone, there is


PHONE STORAGE(.98 GB)
INTERNAL MEMORY(1.77 GB)


Now is that .98+1.77 from those 4 GB (ROM memory) – or from where? And what is the difference between this phone storage (.98 gb) and internal memory (1.77gb)?
Welcome to the Android Enthusiasts – and congrats, you've found the correct tag for that question!

Now a little magic which is not that obvious (and thus often overlooked): Hover your mouse over the tag, it will reveal a short description and some links. Click on the info link, and find your answer :)

In short here: When manufacturers speak of "ROM", they quite often use this term in a wrong way. The correct meaning of the term is Read-only memory, which is clearly not the case for those 4 GB. What they rather are is the all-over storage contained in the device: system (read-only) + internal + device storage. For details, please see the already mentioned tag wiki.

Manufacturers use the term ROM in a wrong way to show off with "big numbers", unfortunately – which causes a lot of confusion amongst customers.