Not really a mobile person when it comes to gambling as I take my sweet time to realize my luck and plan my bets and cant generally do when I am on the go. I personally prefer desktop when it comes to gambling or even work . I take out time during work to gamble a little or while at home when I bored and looking for some excitement.
I also don't gamble on my phone because it feels even more addictive. If you have to take your gamling to work or with you to the bathroom you're starting to look like an addict.
Also where do I use my phone? Usually out. So at work, in public transport, while walking. I wouldn't want other people to know what i'm doing and avoid looking tense and emotional in those places.