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Sending a physical postcard from a mobile phone is a standardised activity: https://www.nowsms.com/oma-mms-postcard-conformance

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The end user (my mother, sister etc.) definately wouldn't know that.

I remember when Youtube came out, and all the nerds said "I could write that easily, not that big a deal".

This is why knowing who your customer is (and what problem you're trying to solve) is essential.

There was a load of publicity ~a decade ago about this, with lots of mobile operators pushing the service. They did do the marketing, but MMS was the success we know it was(!), cameras in phones weren't top notch, and the service was used once only by lots of people who have now forgotten all about it...

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