I was playing a fair bit on my phone during public transport rides on my commute to work but I've stopped that lately.
First, I want to use pokertracker to track all my play, and I can't be bothered requesting hand history emails from my phone before inserting them into my pokertracker database later on. That's all automated on my PC at home, capturing
hands in real time so it takes away the need to do that.
Second, playing exclusively on my desktop makes it feel like I mean business. Mentally, it's like I'm doing a work from home job in a home office and I find I concentrate more and play better. Segmenting that time off, this is poker time and not something I'm doing just to keep me entertained while travelling.