Electroneum as a mobile based cryptocurrency should be able to utilize, features of some noble phones and also this feature can even increase the security of the mobile app wallet.
The fingerprint on the smartphone since its inception is a great way of security on the smartphone and some mobile wallet like blockchain.info have adopted it into their walls to improve the security. Imagine sitting in a public place and you want to use your electroneum wallet but you also have to use your PIN to unlock. People going about can easily see your pin while you are typing. 
This feature looks like this on the blockchain. Info
Suggestion
Electroneum should also add the feature to add fingerprint as login as a login option instead of PIN because its more easier and secured than the PIN.
The feature can be place in the settings as seen here on the blockchain.info app.:
The feature toggle can be placed on the settings here:
Essence of the feature
This feature will create more security for the wallet.
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I think it is only a matter of time until they add biometric login methods. Everything else would not make much sense
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