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Yes you can, for most things BirdRing works just fine without an internet connection. So you can use BirdRing on a device without a SIM card. However selecting a location on a map is kind of ‘blind’, as you don’t actually see the map, just your own position.
Of course you can send your observations once you have a Wi-Fi connection to the internet.
Tip: if you have another device (like an iPhone) that has mobile internet, usually you can setup a Wi-Fi hotspot that enables you to access the internet from your Android device that does not have a mobile internet connection itself.