Abstract: Aspects of multi-subscriber identification module (SIM) small cell fingerprinting are described. In one embodiment, a first communication link is established with a first macro cell for a first communications service, and a second communication link is established with a second macro cell for a second communications service. Further, access neighborhoods of the first and second communications services are measured. Using the access neighborhood measurements, a fingerprint for a small cell may be generated. In this manner, fingerprints for various small cells may be generated, where each fingerprint includes measurement and/or positional data from two or more access networks of different communications services. Proximity to a small cell may be detected more reliably when using such fingerprints, because the fingerprints include measurement and/or positional data from two or more access networks.