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[–] HoneyNutStallmans ago 

If payment channels for Bitcoin goes through (you can transfer money as needed without actually sending anything until the transaction is finalized or a set time period has passed; you only pay the network fee on the final amount) there's a really interesting use case for pay-as-you-go phone/wifi service. The only problem is that it works well with one provider because you have to open a payment channel for each party.

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[–] luckyguy ago 

Opening a payment channel between parties can be automated easily. Their wifi has an id it broadcasts (say a bitcoin address). A WOT that you access over 4g tells you if they're worth paying. You send a bitcoin transaction through the 4g or a a direct signal to the wireless station and then announce the payment (will process faster if they have the payment and can veryify unspents). You exchange public keys (possibly tied to those bitcoin accounts) and use it to do a diffiehelman key exchange. Now you're talking.

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[–] HoneyNutStallmans ago 

Like I said, the only problem is that each channel costs a fee. The more indepdendent APs there are around, the more fees you have to pass.