Is there any upcoming bounty campaign ?
Yes there will be, we will announce it here and let you know when it will be happening : )
With Smarts it will be possible to make purchases using cryptocurrency, while using your own mobile phone, very cool! What is the minimum amount to invest?
You are very correct. The minimum amount would be 100 (SMT's) which would be about 0.076 (ETH). But, if you invest at least about 12 ETH, then you will get company shares and will profit directly from everything Smarts earns in dividends.
And to answer 'maitseasi', the Tokens will can be used if you want to set up a Vendor account (store owner and want to use Smarts) or a customer using the app - the SMTs can be used to cover crypto transaction fees, so your purchases will be cheaper than it says on the price tag.