Originally Posted by Dubai Stu

Callbacks double the chance of a call not going through. Most cellular networks are optimized in a way that if the network is overloaded, outbound calls go out and incoming calls go to voicemail. Customers notice when an outbound call fails, but often rationalize away why an inbound call is missed (if it doesn’t happen all the time). When you trigger a callback call, you’ve got a potential problem with the USSD or SMS getting delayed and in you are more susceptible to network congestion. Sometimes, you will need to manually trigger the callback with the USSD command, “***111***6175551212#.” Program that into the phone directory at least so that they can call your office.