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I know that. My solution is to send her an SMS to "land line" first to tell her to Switch the cell on. I don't know whether it is the same in other countries, but in .ch a SMS send to land line will be delivered... in the way a synthesized voice does read it
The first time I got an SMS voice message on my landline it was a female voice saying "Hi Dad, I'm going to be late - please can you come and pick me up". The confusion was that I did not have any daughters. So, I asked my son who had just arrived home and he said it was a text message that he had sent an hour ago, but had only just arrived.
You're being too literal in your interpretation. Think about it. Regular phones have the tendency to not always be available by virtue of them being stationary. So, when you call one the person may or may not be around to answer. Thus, cell phones were invented to avoid this. However, by turning off your cell, you essentially have the same net effect as the olden days.