Cell phones do have the E911 service.
Of course, if you carry your phone and you run off a cliff 20 miles from your home, they won’t be able to locate you via your address.
But, then, you can’t carry your landline with you when you go out, because the cord isn’t long enough.
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Some, I don’t know the extent, cellphones have GPS tracking built in.
Yes, cell phones do carry E911. But, if you are in San Jose, CA and make a 911 call it will automatically be routed to the California Highway Patrol Call Center in Fairfield, CA, some 60 miles away.
Your E911 call, using a cell phone, will not determine your location. I can give you more info as to why later but when you make that call using a cell phone you run a greater risk of sitting a que for a longer time than a landline customer and they have no way to figure out where you are.
If you don’t know where you are specifically, you are going to remain on the phone answering a bunch of questions.
Now you are talking about mobile service and it’s not likely they can locate you real time.
Their systems are not set up that way. Funny how the government excises a tax of $1.50 a month to build a system that could but in the 17 years you have been paying that tax any system that has been built is kloogee or hogepoge but, more likely non existent.
All cell phones carry 911 service but they do not carry E911 service nor do they have PSAP service which will deliver an address to the emergency service provider.
The best they can do currently is figure out what cell tower you are transmitting on and the previous towers you egressed and ingressed.