Samsung Galaxy S3 I9300 is not getting official Android 4.4 KitKat upgrade any time soon. Or maybe forever no as Samsung just cancelled its plan to do so. However, there is still hope to run KitKat on Galaxy S3 I9300. Yes, there is an unofficial Android 4.4.2 KitKat TouchWiz ROM for Galaxy S3. It is based on Galaxy Note 2 N7100. And still in Work-In-Progress status. So be sure to face lot of bugs flying around. Do try it only if you know what all is about…
Personally, I don’t install custom modem on my Samsung Galaxy S III. I will stick with the modem (radio / baseband) that comes along with the firmware unless the modem is highly recommended by others. So have to install official custom modem on your Samsung Galaxy S3 manually. What is the benefit of using custom modem? Using the correct modem will give your Samsung Galaxy S3 better signal coverage, reception, speed and battery life. Choosing the correct modem take time. You need to benchmark the 3G speed, battery consumption, signal strength… Monitor its performance for days. So I don’t change modem much unless I found the one that I am using is bad.
Which Samsung Galaxy S III modem (radio / baseband) is the best for me? Different region have different Samsung Galaxy S3 modem because carrier, frequency band, topography, location and distance from cell tower are not the same. So you need to try Samsung Galaxy S3 modem yourself to find out the best Samsung Galaxy S3 modem for you. Using the correct modem will give your Samsung Galaxy S3 better signal coverage and battery life. By the way, these official Samsung Galaxy S3 modems are for GT-I9300 & GT-I9300T models only.
