GSM or CDMA cellphone for telemarketing (ers)
Today, I've received 4 phone calls from AirAsia - HSBC credit card salesperson.
They were using these numbers +628138370xxxx
Few weeks ago, I also noticed that salesperson and marketing person of Indovision also using Telkomsel cellular phone number.
Asking here and there and googling, perhaps these companies are using some GSM/ FWT gateway.
GSM: Global System for Mobile Communications
FWT: Fixed Wireless Terminal
Basically, these devices allow you to redirect your call through the numbers of the same carriers (operators) so you can save some fee because normally, calling a number from the same carriers should cost you less.
They were using these numbers +628138370xxxx
Few weeks ago, I also noticed that salesperson and marketing person of Indovision also using Telkomsel cellular phone number.
Asking here and there and googling, perhaps these companies are using some GSM/ FWT gateway.
GSM: Global System for Mobile Communications
FWT: Fixed Wireless Terminal
Basically, these devices allow you to redirect your call through the numbers of the same carriers (operators) so you can save some fee because normally, calling a number from the same carriers should cost you less.
From Amazon, this is how they look like: