The usefulness of landline random digit dialing (RDD) in epidemiologic studies is threatened by the rapid increase in households with only cellular telephone service. This study assessed the feasibility of including cellular telephone numbers in RDD and differences between young adults with landline telephones and those with only cellular telephones. Between 2008 and 2009, a total of 9,023 cell...

The original impetus for CDMA's development was the enormous popularity of existing narrow band analog FM cellular telephone systems. There is only so much radio spectrum available to deal with the flourishing demand for cellular service, and severe congestion already exists in several major service areas. A IS-95 system can carry about 10-15 times as many voice calls as an analog system in the...

BACKGROUND The widespread use of cellular telephones has heightened concerns about possible adverse health effects. The objective of this study was to investigate cancer risk among Danish cellular telephone users who were followed for up to 21 years. METHODS This study is an extended follow-up of a large nationwide cohort of 420,095 persons whose first cellular telephone subscription was betw...

Telecommunications in developing countries lack adequate planning and policies, so their telephone densities show the lowest values worldwide. The failure in considering the complexity of the regional telecommunication system in developing policies and technological strategies has increased the telecom gap between other regions and this particular sector of the world. We used a system dynamics ...

BACKGROUND Because of a belief that the use of cellular telephones while driving may cause collisions, several countries have restricted their use in motor vehicles, and others are considering such regulations. We used an epidemiologic method, the case-crossover design, to study whether using a cellular telephone while driving increases the risk of a motor vehicle collision. METHODS We studie...