My Firebase Android app is not working whenever I connect with mobile data. All features such as auth, database and storage are unreachable. I am currently in India, using a
Firebase server does not have any restrictions on internet connection. This would be your mobile internet provider's issue. Also, it would be worth checking whether have any settings in mobile device is enabled to restrict mobile data usage for any specific apps like to use Wifi only.
PS: I'm from India, use Airtel and Vodafone mobile data connections often for Firebase based apps when Wifi is not around . But occasionally faced similar issues when don't have sufficient signal range especially changes to 2G.