We have been seeing a drastic increase in the smartphone penetrations across the globe. These smartphones have replaced feature phones from the hands of people, which in addition to improved data connections has made smartphones the primary point of access to the internet.
Bitcoin is a product of the internet, and is rightly called the currency of the internet. We need internet to make any Bitcoin transaction across the globe. Blockchain, the ledger for Bitcoin transactions is also available on the internet.
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http://www.livebitcoinnews.com/now-access-blockchain-using-any-phone-with-smsblockchain/
