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The range of new possibilities built into mobile phones has only become possible thanks to the enormous technological advances that the sector has undergone in recent years. From the first analogue handsets, technology has evolved to the second generation, digital systems, and today it is reaching the 4.5G level, the fourth generation of mobile phones. In reality, the evolution of mobile telephony has unfolded in different technologies in terms of the technical quality of their operations and the possibility of services. The digital systems that first established themselves on the market are TDMA, CDMA and GSM. Finally, however, the big difference is the availability of new functions, which mean that mobile phones are no longer just a phone but an electronic support for the most diverse actions.