Mining on computer is profitable and which altcoin is best for mining?Can we do that kind of job in mobile phone samsung galaxy android version or we cant.I also dont know where I can buy ASIC for cheapest and how much is price average?
It really depends if you have already some usefull hardware with a powerful graphic card, or if you plan to build everything from scratch. If you plan to do some investments to your hardware, your ROI will be longer (may be one year or even more), but at the moment when you cover your investments with your earnings from mining, it will be a pure profit. So general answer is yes, it is profitable. The other factor is also your electricity costs. If you want to calculate your real expences, use some online tool for calculating it. For example this:
https://whattomine.com/