If at the time of the hard fork november 15 you will in bitcoins, then be sure to keep them on exchanges, otherwise you will not be able to make deposits for sale, both sides do not want to put protection from repeated transactions
what if we store bitcoins in an mobile wallet, is there any consequence?
is it still can be using for transaction.
As long as you have the private keys it doesn't matter. The only thing that matters is if those mobile wallets, web wallets will show a statement that they are supporting these hard forks and will be distributing those coins after all. There's no need to worry about it, it's like the same hard fork after all but the next one Segwit2x is what everyone is worrying because it got a lot of support.