Many types of electronic equipment found in homes and offices emit electromagnetic radiation, and clashes with outside radio signals once were more common. For example, when cellular add-on cards for laptops first came out, emissions from the CPU sometimes kept the radios from working, Marshall said. In addition, there used to be laptops that put off enough radiation to interfere with onboard navigation systems on planes, said analyst Craig Mathias of Farpoint Group.
Since then, filters and shielding have improved, they said.
"All of this electronic equipment could potentially interfere with mobile phones, but care is put into the design to avoid these problems occurring in practice," Marshall said.
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