Best things with cell phones you don't have to carry the bulk of a slr camera around the neck, lenses, etc..
There's a saying, "the best camera is the one you have with you." 90% of the time it's my iPhone. Part of the fun when you get out shooting is the equipment, sort of like having different keyboards,PA systems, mics and related equipment.
I'm signed up Tuesday night for a Christmas photo walk in downtown Providence, it's sponsored by a local camera shop. Yes I'll have my iphone and will take shots with it, but the DSLRs will do the heavy lifting.