Dec 15, 2020 - 05:00 AM
Fortunately though on an overall basis, "holes" in the networks have dropped significantly due to the increase in the number of cell sites and the advent of small cells. Nowadays, most areas where consumers use phones are covered well. However, dropped calls can be caused by a lack of capacity on the network or by driving in an area where there isn't coverage. The former is worked on frequently by wireless carriers and has definitely improved a wide margin since 2004. On the latter, coverage gaps are rare in urban/suburban areas and are normally due to zoning restrictions or other issues that prevent the carriers from deploying sites where they want to. In rural areas, the issue can be zoning but is more often related to there just not being a sound business case to deploy a new cell site. (not enough people)
For widely used tunnels, the issue is more of one that the owner of the tunnel won't allow wireless equipment in the tunnel or wants too much money to allow a carrier to install it.