How long does an audio subliminal message work for?

How does this top-upping credit for international call by sending a message to such as 88077 work in uk?

• I use one international call provider and if i run out of credit, i have to send a message to 88098 with the unique word for example, then at the end of month all those charges are added onto my phone bill from my network provider, how does it work and what are the requirement to so please help thank you guys

• Answer:

  I'm not authoritative in that, but I'll tell you to whatch out with it. When I lived in UK I saw a bunch of sh1tty "send messages to XXXX number" scam where you'll pay them for the rest of your life - hard to cancel (forced) "membership". It almost seems it's legaly binding to send a message with a word, as much as signing a serious contract! Sorry I can't help further. WHY DON'T YOU USE VO-IP??? :)))) Much better! I used it all the while I was there (and throughout Europe and Oceania). Won't get any cheaper! Doesn't need to.