Cost isn't that much of an issue. Waterproof is nice, but I've thus far managed to avoid dropping any of my phones in a toilet so I think I'm ok with that. Dual-SIM? Not sure what I'd use that for. What would be more handy would be the same number on more than one phone..
Dual sim is handy if you've got a work phone and don't want carry two phones. Also good if you have a data plan on, say 3 and call plan with another provider.
Cost isn't that much of an issue. Waterproof is nice, but I've thus far managed to avoid dropping any of my phones in a toilet so I think I'm ok with that. Dual-SIM? Not sure what I'd use that for. What would be more handy would be the same number on more than one phone..