Pagers is a bit old technology, and was really cool stuff until mid 90's. I still find the pretty cool, they are small, low power and quite reliable. I will collect some links and resources on the pagers i get my hands on here.

Motorola Advisor

Motorola Advisor is an alpha pager with a 4 line backlit display supporting up to 4 RIC codes.

Motorola Advisor RIC code checker

There are some rules for Motorola Advisor codes, this will help you check that your codes will work together
Code A0
Code B0
Code C0
Code D0