Precise Mobile Location

Hi Experts
Please, anyone, help me with the following:

We know that through GMLC/SMLC we can get a mobile location, but that location is up to Cell of tower, which is not accurate and also does not fulfill our needs. Please, if anyone recommend other tools or sources, like a company to get the required equipment from them and plug in with the operators’ network for retrieving the precise mobile location.
Thank You