Let's see if I have this right. I have an iPhone. My wife has a dumb phone, and we haven't upgraded her because she doesn't need an iPhone and doesn't want to spend another $30/month on something she doesn't really need. So, currently:
For $120/month, we get:
Unlimited text
Unlimited mobile-to-mobile
700 Anytime minutes
3GB of data for one phone
No tethering (I sometimes turn tethering on when I travel, but it's another $20/month for it now).
Under the new plan, we would get:
Unlimited text
Unlimited phone usage (mobile-to-mobile, anytime, or otherwise)
4GB data for two phones (which is all we'd need)
Tethering included
...for the monthly price of $70+40+40 = $150
An extra $30... which is what we'd be paying right now if we wanted to get my wife into an iPhone. Buuuuut... the new plan has tethering included. That makes the new plan a better value.
Plus, if I had tethering on a regular basis, my current bill would be $140, and the new plan would be $150 - making this decision a no-brainer. It would be getting my wife into a smartphone for only an extra $10 instead of an extra $30.
(I know, I know, they're trying to lock us in as customers, make it harder to leave and all that... but we're husband & wife, and one of us won't be jumping to a new company without the other... that wouldn't make sense.)
If we were a two-smartphone family, there would be no change in our monthly bill. The only difference would be that we'd share 4GB of data between us instead of having 3GB each and we'd have tethering included.
To get the same 6GB of data, it would be $90+35+35 = $160 a month - only ten bucks more.
While I recognize that I'm getting less data than I would if we both had smartphones, I simply don't use 3GB a month as it is. We would consistently use less than 4GB every month, so it only makes sense to pay for that plan.
I think I've thought this through correctly. Anyone spot any errors in my logic?