LOL. Ridiculous! How much per MB does it cost? And do they not allow that they instead cap you, or close your subscription for the rest of the month? Do they notify you that you reached the limit?

It really depends on what you use your device for. You can download some heavy bandwidth stuff via your WLAN, USB, or BlueTooth. Just surfing around will not cost you much (especially not if you'd use Opera Mini btw) except for things like software downloads, some big pictures and Flash (banners, Youtube). Using specially crafted websites like .mobi won't burn much.Things like checking your e-mail, getting updates on OMWeather, using AGPS hardly use data traffic while they're very useful being able to use 24/7 as is the case with a good WWAN network. With current tablet you can grab RSS feeds in the morning and use 'em throughout the day, and check your e-mail in morning too. With WWAN, you can do this throughout the day, and the traffic is really minimal. Just be careful wrt roaming. All in all, for the usages I described you'd have more than enough with 400 MB. The added latency does not matter for something like OMWeather either. Think about it: 13 MB a day, and if they're a nice corporation they won't bother about a few MB more one month if you use a few MB less the other month.

My issue is rather. Will they allow a mobile phone subscription, or a laptop subscription? The laptop subscriptions are more expensive. But allow more data being used, and do allow tethering. This is calculated in the price of the subscription.