Can one download a GPS tracker for an Android device with no pre-installed tracker?

Yes anyone can download any kind of tracker for the device, may that be of freeware sites and web pages, the internet GooglePlay Market or IOS market.

The installation process takes a small amount somewhere about 10 minutes. Depending on the application size which can be from 3 -5 MB to 60MB the download is really fast. Setting up the application to work properly and testing can take up to 20 minutes of your time.

Settings that you need to adjust are the number of users on the phone, who will use the phone, and who you are going to track. What data are you going to track, SMS messages, calls, and contacts, location on the map, or every data stored on the smartphone? Some applications require a sign-up subscription to one of their sites in order to allow secure cloud storing service and real-time and offline view of the monitored and logged data stored on these servers. The sign-up process requires your name, address, email address, and other personal information which you decide to share or not.

Some non-modern Android phones don't have a built-in GPS tracker, but you can install trackers on them also, and they will use the internet, wired or wireless connection, internet IP address to determine your current and future location.

In order to install the tracking application, you need to have admin privilege on the smartphone or by an administrator of the owner, you need to be able to know the password to unlock it.

Non-owners cannot install any tracking apps on your phone and they cannot do that remotely they need to have physical access to the device. Use of GoogleMaps and tracking is available on any device, from the old legacy outdated device to the most modern technology running android 5 and up. Some have GPS built some don't but you can get details about your whereabouts with the use of the network if you can access it.

But today there is a small number of devices that do not have built-in GPS devices, so you don't have to worry much about having the required hardware in order to enable its users to track features and share the location with your friends, social media, parents and other. To be able to install a GPS tracker on your Android device you must own the smartphone, have access to any kind of internet connection from which you will download the application, the device should have the necessary GPS hardware, and the user should confirm the required permissions in order the application to work. There is not any kind of limit of age, location, of the user. And it doesn't matter from which source you gonna get the application.