A hybrid mobile phone can hold up to four SIM cards. SIM and RUIM cards may be mixed together to allow both GSM and CDMA networks to be accessed.[12][13]
From 2010 onwards they became popular in India and Indonesia and other emerging markets,[14] attributed to the desire to obtain the lowest on-net calling rate. In Q3 2011, Nokia shipped 18 million of its low cost dual SIM phone range in an attempt to make up lost ground in the higher end smartphone market.[15]
Kosher phones
There are Jewish orthodox religious restrictions which standard mobile telephones do not meet. To fulfill this demand, phones without Internet access, text messaging or cameras are required.[16] These restricted phones are known as kosher phones and have rabbinical approval for use in Israel and elsewhere by observant Orthodox Jews. Some are even approved for use by essential workers (such as health, security and public services) on the sabbath, even though use of any electrical device is restricted.[17]
Although these phones are intended to prevent immodesty, some vendors report good sales to adults who prefer the simplicity of the devices.
Mobile phone operators
Global mobile phone subscribers per country from 1980 to 2009. The growth in users has been exponential since they were first made available.
Main article: Mobile phone operator
The world's largest individual mobile operator by subscribers is China Mobile with over 500 million mobile phone subscribers.[18] Over 50 mobile operators have over 10 million subscribers each, and over 150 mobile operators had at least one million subscribers by the end of 2009.[19] In February 2010, there were 6 billion mobile phone subscribers, a number that is expected to grow.[4]
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