Pagers still have some advantages over mobile phones. Coverage tends to be better, especially indoors and their battery life can be measured in weeks rather than hours. They can be used in places where mobile phones are banned for security reasons, or where they might interfere with sensitive equipment. Pager messages are broadcast in clear text by powerful transmitters over FM radio bands. You’ll need a cheap USB DAB/FM radio receiver to decode them. I bought mine for less than a tenner.
A search for ‘sdrsharp pager messages’ should give you give you all of the info needed to get up and running. For the technically inclined, the system works by modulating a tone between two frequencies to create a binary stream. The transmitter alternates these frequencies very quickly – up to 6400 times a second. Here’s a sample of some of the messages that I decoded:
0101158 23:39:12 29-07-15 FLEX-A ALPHA 3200 FROM GLOUCESTER POLICE CONTROL ROOM, HAVE ASKED EVERYONE AND NO POLICE OFFICER HAS THE KEYS THAT HAS BEEN MISLAID. TEL NO IS 101 IF YOU NEED TO CALL. 0121305 23:01:17 29-07-15 FLEX-A ALPHA 3200 PLS CALL ANNE AT OBSTETRIC THEATRE ON 458 47`` 0118459 23:58:43 29-07-15 FLEX-A ALPHA 3200 20150729 23:57 boc1web03.servstream. com:conn CRITICAL ALERT 0119043 23:58:45 29-07-15 FLEX-A ALPHA 3200 Room S17 Isolator Z21 Hatch Pressure BMT 42.5 (Alm:D Lmt:<50.0000 Grp:BMT)
I’m surprised that no effort is made to encrypt the messages because many of the messages contained personal details such as names, addresses and phone numbers.
Warning:Whilst it is extremely unlikely to get you in trouble, decoding pager messages is illegal. See Section 48 of the UK Wireless Telegraphy Act: http://www.legislation.gov.uk/ukpga/2006/36/section/48