The good thing about android phones is that they can be updated to newer versions. There are various types of android versions like 2.3.6 and 4.0. Updating your android phone into newer versions has the advantage of ensuring your phone functions well and is compatible with many latest android apps. It's recommended for you to regularly check your android phone for system updates.
Here is how to update your android phone to latest versions.
Go to:
>>Settings (Android Settings)
>>About Phone
>>System Updates
Ensure you have enabled internet connection on your android phone. It's recommended to use Wifi connection because the update may consume a lot of data. After your phones has downloaded the latest available system updates, it will request your permission to install those updates. Ensure your phone is fully charged before installing the system updates. The process might take a little longer therefore don't try to interrupt the installation process. Your phone may reboot several times. Don't worry, just give it time to finish installing system updates.
You've learned how to update your android phone or rather how to check for android system updates and install them.