There used to be rules with teeth that cell carriers must be able to locate 911 callers for the operator. Cingular got a tiny fine in 2003, less than their office party spend, but it motivated them (as AT&T) and TMobile to adopt the (expensive) UTDOA technology to comply. Sprint and Verizon did not, staying on A-GPS which has indoor limitations. People kept dying indoors, but meanwhile, the regulations demanding indoor accuracy are still in "proposal" and "study" phases in 2018 [2].
You can still get fined a little if you drop a BUNCH of 911 calls altogether, but for wireless location, life isn't worth much.
1. https://www.wsj.com/articles/SB105546175751598400
2. https://www.fcc.gov/public-safety-and-homeland-security/poli...