Despite most governments do not recognize Bitcoin as a currency, all those restrictions and existing laws relating to online and mobile gambling apply to bitcoin gambling. If online gambling with fiat money is illegal in your jurisdiction, then it is also illegal with BTC.
But it will not be considered as illegal if there is no any statement about BTC being a currency in your countries law. If it is not a currency than defination will still be a computer generated token and gambling with it would be only considered as computer game. 