Yes. You can go to the Apple APP Store on any computer and on your iPhone and on an iPad if it is capable of connecting to an available cellular data network.

However, iPods and iPads that are not cellular models will not be able to access the Apple APP Store without a WiFi connection.

No, the iPod Touch cannot run on a cellular network. It doesn't have the capabilities to do so, and only works with a Wi-Fi connection.

Since iPods do not have a cellular network, you will need a Wi-Fi connection in order to send a text.

Yes, it does. Facebook's messenger app is an extension of its internet site. Given that you cannot access Facebook without connecting to the internet by some means, the same goes for the Facebook Messenger app. That said, the app should not require a WiFi connection if you have the cellular data on your phone turned on. Data can be used instead of the WiFi connection to utilize the app, along with any other social platform apps such as Twitter and Instagram.

1. The first thing you'll need to do is purchase a cellular security camera , Ex: Vosker v150 camera as well as a SIM card, battery, and charger. The SIM card is what will allow you to connect your camera to the internet. The battery and charger are for charging the camera when it needs it.
2. Install the camera app on your smartphone
3. Set up your security camera within the app, and add the camera's SSID
4. Start recording