I doubt they are all phone cabinets. POTS and FTTC cabs come in pairs quite close together. The FTTC one will have a 240v sticker on it. You may also be looking at VM cable cabinets or even traffic light control cabinets etc.
As the earlier poster said - look for cabinet with the number on it the checker site says you are connected to (that will be the POTS cabinet).
Edited by kwikbreaks (Sun 23-Mar-14 11:14:35)