| AT&T | 1343 Alpine St | Tower switching contantly, roams, and no voice indoors | 2015 |
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| Verizon | 4720 W 12th St | Dead Zone, From Verizon Representative. | 2019 |
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| AT&T | 1013 Main St | I can hardly get more than two bars anywhere in Longmont. I can only make or receive calls if I use Wi-Fi calling. The sound quality is still poor or it may take several tries to connect. | 2019 |
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| AT&T | 736 Main St | 4-8 block area around here where cell coverage for data and phone is almost non-extstent | 2019 |
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| AT&T | 666 Coffman St | Dead Zone - entire downtown | 2015 |
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