It's the first time I heard about a mobile wallet providing this kind of feature. It should be a primary criterion though, since several mobile wallets have been hacked because of their lack of entropy in the past. On which form could we enter entropy? Only base 6 numbers(dice) or decimal, binary and hexadecimal values are also accepted?
In bluewallet, you can generate a seed phrase with entering your own entropy manually.
The entropy source can be a coin flip, a 6 sided dice roll or a 20 sided dice roll.
For more information on how to create a wallet with providing your own entropy on bluewallet, click
here.