Granted, the "nickel and diming" of hotline numbers (1900, 0900, etc) was nowhere as bad as today's cash shops, but a lot of us simply forgot they were always hungry for all our money
Here's a bunch other hotline ads for you to peruse - https://www.retromags.com/gallery/category/1729-telephone-hotlines/
PS: I never understood these american numbers that used letters, how were you supposed to know what was the actual number?
I also went with magazines or small "cheats only" booklets, since they cost about 3 minutes of a hotline call, hoping it'd have the cheats for the games I wanted. Sometimes it did, sometimes it didn't. Then there were the cheats that just didn't work