h a l f b a k e r y"It would work, if you can find alternatives to each of the steps involved in this process."
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A calling app that displays the time in the destination city and, if between the hours of perhaps 11pm and 6am, pauses and asks if you want to proceed.
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"The person you are calling is 3 hours ahead of you. Do you still want to make this call?" [+] |
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What if the destination is not in a city? |
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Cell phones know which cell they are connected to, & that has a location accurate enough for this idea. (I'm assuming you dial, then the message happens, before the recipient phone rings (or not).)
A satellite phone could be a problem, unless those have a GPS function tagged to the call data. |
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It would probably require a permission setting to be enabled on both user's phones, similar to sending/requesting read receipts for SMS. |
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