Satellite phones, also known as satphones, can work in areas without cellular coverage, such as remote or oceanic regions, but they still require line-of-sight access to satellites in order to function. This means that they may not work indoors or in certain areas with heavy tree cover or high terrain. Additionally, different satellite phone networks have varying levels of global coverage, so the specific area in which a satphone will work will depend on the network it is using.
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