Hi all,what is different with rouming callback and CAMEL rouming for prepaid cards?Why with rouming callback outgoing calls is 50% lower and billing in realtime or no?

Welcome aboard!

I have never heard of CAMEL roaming. Do you have a link or some other definition? Is CAMEL a company or service?

Also, I am not quite sure what you mean by "roaming callback"?

When you roam (use your home country's SIM/phone in another country), some providers do not allow you to call the number DIRECTLY. Instead you must use a callback method. Some time ago that was indeed the case with T-Mobile Germany SIMs for call placed in the United States. However, since then, one can dial any number directly using a German T-Mobile SIM in the US.

In general, calls placed (and received) from a country (received while you are in a foreign country) are billed at higher rates than calls made from the home country.

Stan

it's USSD rouming CALL BACK for WIND prepaid card like dial *123*number#call and wait for incoming call...CAMEL protocol it's direct dial when is prepaid make call in rouming but why is USSD roaming callback is lower price?

Yes, CAMEL roaming is what T-Mobile prepaid uses around the USA. Except for the screen display you wouldn't know that you are roaming.