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Tech2026-03-22/4 min read

Does a metal bumper case block your iPhone’s cellular and GPS signals?

Concerned about connectivity? We explain do metal cases block signal issues.

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Priya Nair/The iPhone Project Journal
Does a metal bumper case block your iPhone’s cellular and GPS signals?

Metal cases look sleek, but do metal cases block signal bands?

Yes. Aluminum is a conductor that acts as a Faraday cage, blocking electromagnetic waves. This can cause dropped calls, slow cellular data, and inaccurate GPS navigation.

To avoid signal issues, choose premium plastic, polycarbonate, or hybrid TPU cases.

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