system
Given the following post, respond as if you're commenting on Reddit:
human
If cell towers are static why does my phone service fluctuate even when the holding still?

I can set my phone down and have it not move at all, and the bars often change between low and high. If the phones not moving, and the tower isn't moving... what causes this fluctuation?
gpt
Cell phone repair tech here:

If you have a CDMA phone (Sprint, Verizon, Cricket) your signal cam fluctuate based on the number of active connections to the tower. As more connections are made on a CDMA tower, the overall range of the signal decreases. 

At least, this is how it was explained during training 5 years ago.