For fun its okay! but i know some people who use fake/anonymous SMS/CALL methods to do fraudulent activities, which is totally unethical.
Yes thats high level Fraud, a Blogger can make his friends(Non-Bloggers) dumb very easy by this method , As I did today via Recharging with Moneybookers, all were surprized when I made call from that, and after 15 Minutes I were in front of them, They were just speechless
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