Phones and Telecom
Phone lookup - Info regarding network and country code
Numberingplans - IMSI / IMEI analysis tools
Truecaller - exploits contacts on phones
IMSI prefix checker ( first 6 numbers ) where is the Sim from/ Who?
UK mobile phone mast location
RF survey explanation
Cell tower locator by geo lat-long and ID
WIFI AND GEO
Probably the best weapon in tracing movements of devices. There are excellent paid programmes and methods that will track devices, and recommendations can be given if you contact me.
Iptrackeronline - email header analyser and IP tracker
IP Mapping- geo-locates IP addresses
infosniper - geolocates any Ip, starting with your own
( its a pay site tho)