Is it possible to see sends and receives trough the router?

If someone has access to the main router, can he check the connected devices activities? For example if an iPhone is connected to this router, is it possible to check what does the app's on iphone do. Or being able to see or read images and texts?

If so is there any way to encrypt data?

Yes there's. In you internet browser type 127.0.0.1. This is usually the default but it may be different. This is the router's IP Address. When you get here make a password, Disable the SSID, and enable WPA2 encryption. This will keep you safe. Routers that arent password protected and WPA2 protected are easy to hack and see all that info you are send and recieving from the internet with a couple free programs.these 3 things will keep you safe.

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