Specification:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZyk244HknOnZfFf8VCM3P1DiqQ1QyBWZZRLDb36TRV2MdAL0WZG4TJISMyntnWEt3sADV_ArAZVnzKcuGrK2qWKEHWrMvVi5HjJpGYhIQnLtK8RHO_CNyURq41zyuzoJFF5PN70gqNZ5l/s320/vivo-x21-1725-1728-original-imaf5nnhzrjr9hnf.jpeg)
Cell Phone,In the 1990s, the 'second generation' mobile phone systems emerged. Two systems competed for supremacy in the global market: the European developed GSM standard and the U.S. developed CDMA standard. These differed from the previous generation by using digital instead of analog transmission, and also fast out-of-band phone-to-network signaling. The rise in mobile phone usage as a result of 2G was explosive and this era also saw the advent of prepaid mobile phones.
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