Ours is about 55-60 bucks [plus taxes] for two phones, shared minutes--we get 500 anytime, 5000 N/W, and we're at about 3600 Rollover minutes. Basically more minutes than we'll ever use, and it's cheaper than two separate accounts. Free roaming, long distance, three-way, voicemail, etc. We're not interested in the 'extras' like SMS [I have a two way text pager through work I use for this], ringtones, games, pictures, etc.
Coverage area does matter: If a provider could give me good, solid, service at and in my home, I'd go with them in a minute. And possibly drop the landline.
Going cell-only: Some satellite tv providers, Tivo units, or home alarm systems require a land line to be hooked to their hardware.
Also, in many communities the Enhanced 911 doesn't work with cell phones [how often do you call 911? not often, but when you need to, you want it to work.] Then again, I've also heard that any 'working' [ie, connected] phone line *has* to allow you to call 911. Maybe it's just the 'basic' 911, where you have to tell them where you are.
Also, not sure about this, but I heard someone say they needed a land phone number to apply for credit or start an account at a bank.
Check your landline bill--there's a lot of crap you can cancel. You don't need that 3.00/month 'inside wiring insurance', and how often do you actually use call waiting? If you are paying for voicemail, go to Walmart and get a tendollar answering machine, you're set.
Ask for the cheapest plan they have--we went 'all basic' and our phone bill is like 12 bucks a month before the taxes/fees [which are a whole other level of BS].
Shop around for long distance: I tryto use the cell for LD, but it's not an option at home. I *will not* pay a monthly fee to 'access' long distance. I'm with Big Red Wire.com, and while they just went up, I think it's now something like 5.1 cents a minute with no monthly fee and no monthly minimum. My LD bill last month was like 16 cents. I had some telemarketer call, pushing their plan, and once I told him what I was paying, he said, "Oh, I can't beat that, thanks for your time and have a good day." : )
We tried Packet8's VoIP, and while the concept was quite cool, the service was lacking--after about 10-15 minutes, the calls started dropping. And of course I'm not paying the 40 bucks a month Vonage wants [Packet8 was 19.99/mo. unlimited local and continental long distance.]
Anyone read the comic strip Zits? There was a plot last week or so, where Jeremy racked up a 400$ cell phone bill doing all the short messaging.