Is it possible to really send SMS, on behalf of my customer's phone number, without using a GSM modem from kannel?

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You can connect number of cell phones via data cable to computer and send SMS or even make a call. For example good ol' Siemens C35 is perfectly suited for that.

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There are some online services that let you use a custom sender, even a string instead of number. Unfortunately availability may vary among countries.

I know Mensatek in Spain.

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