How much RAM do I need in a smartphone?
A good smartphone must have at least 2 GB of RAM nowadays. Apps and Games takes much RAM so, if you are buying a new smartphone then buy one with at least 2 GB of RAM so that you can have a smooth experience.
How many SIM Cards can I have in my Android Device?
Most of the smartphones nowadays have dual SIM capability. If your smartphone is removable then you can remove the back and check. If it is not removable then you can check on the sides of your smartphones and there in SIM tray there will be 1 or 2 SIM Card slots.
How to know If my Android Device is 4G Supported?
You can check over the Internet by Searching on Google about your Device. You can also check from your Android Phone by going to Settings> Mobile Networks>Network Mode/Preferred Network Type. From there you can know if it shows 4G LTE option.
What is the Android Version of my device?
You can check the Android Version of your Android Device by going to Settings -> About Phone -> Android Version.
How can I Install apps from unknown sources?
To install apps from unknown sources head over to Settings > Security > Unknown sources. Toggle the slider to enable it.