Dell Studio 15 laptops come with mobile broadband too
I feel strangely torn and strangely wrathful at all this. I welcome the future where mobile broadband is ubiquitous when I buy a laptop: it's about time. But does anyone really want buying a laptop to go down the path of mobile phone lock-ins and carrier subsidies besides, of course, the telecoms?
There's no reason accessing 3G on a laptop needs to be any more complicated than popping in a SIM card. I understand the pure capitalist logic of trying to sell a subsidized laptop to everyone through a two year contact and the promise of Internet everywhere, but a world where laptops are leased from telecoms and have deceptive sticker prices along with obligatory multi-year contracts is not the world any of us should want to live in.
Studio 15 Laptops [Dell via Geek Sugar]

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It makes perfect sense.
Sprint & Verizon are CDMA networks.
AT&T & T-Mobile are GSM.
Sort of like a HD-DVD vs. Blu-Ray thing. If they included hardware for all carriers, the cost would go up, and they would need space to cram more hardware.
The ideal solution would be to have a slot that you could stick in a modem card, allowing you to swap cards based on network -- but I guess that is what USB is for.
And actually, to me, "Sprint or Verizon" doesn't sound like a lock at all. Not exactly free choice between all carriers available, but it is still a choice.