Unboxcoin is no more in existence and I'm also sure the wallet app can't be seen on play store any longer cause it can't be used to serve the purpose it was designed to serve when it was still of value to traders. Asides Unboxcoin wallet there are many other wallets that have gone out of service for one reason or the other and so they have become unaccessible to potential users or traders. It's always advisable you check out your desired wallet reviews and information online, this will help you to be informed of the wallet authenticity, reliability and even if the wallet in question is still existing. This would also save you the stress of trying out several unimportant Wallet that are of no use to you.