Using USSD for survey/polls vs SMS

I had a discussion with a colleague on the possibilities of using USSD instead/with SMS to run surveys or polls. The main point of interest was that USSD are free – which can lower dramatically the cost of operations/running surveys on large scale.

Here are some excerpts of a little search that may showcase other advantage like speed – share your thoughts and experience!

I am intrigued on “how come something that can be free is not widely implemented yet” or “why are SMS surveys the popular ones?”

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