Such emergency services are provided by VoIP vendors in the United States by a system called Enhanced 911 (E911), based on the Wireless Communications and Public Safety Act. The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."[38] The VoIP E911 system is based on a static table lookup. Unlike in cellular phones, where the location of an E911 call can be traced using assisted GPS or other methods, the VoIP E911 information is accurate only if subscribers keep their emergency address information current.[39]
Basic and feature phones are less popular overall, but some countries stand out for their high usage of these less digitally connected phones. In India nearly half of adults (47%) say they use a basic mobile phone that cannot connect to the internet. Sizable shares in Kenya (40%), Tunisia (37%) and Venezuela (36%) also report using a basic phone.
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