It depends for me. We're long distance and as Mizznilla said, it can be a little different then because the time you get together is a little more "important" because its like, ya know, all you have.
That said, my guy has a really unpredictable job in media that involves freelance and contract work, and when his boss sends him an assignment be it by text, phone or email, I am totally okay with him taking the call, checking or responding whatever. The nature of his work doesn't really give him the luxury to just tune out, or else the assignment goes to someone else and his contract is void. Annnd then he wouldn't have money to come see me.
If he was just talking shit with his buddy from back home during the day or two we have together, I'd be a little less patient lol