You can appear to have "full service" by virtue of having a strong signal, but that doesn't tell the whole story.
Despite a strong signal, the cell phone network can give you poor voice and especially poor data service when it tries to support too many connections to a single tower. That results in garbled and dropped calls, calls not connecting or ringing to your phone, and very, very slow data throughput. The other reason for slow data is if the tower's connection to the internet (called tower "backhaul") is overloaded.
Or maybe Siri just doesn't care for exercise.
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