Under the iTunes in the Cloud section, click Manage Devices. (If you haven't associated any devices with your Apple ID, you won't see the Manage Devices section.) Information about each associated device appears. Next to each device, you can see when it associated with your Apple ID.
The real reason why the burp smells so badly is hydrogen sulfide (H2S). If you eat foods that have sulfur proteins in them then you may find yourself burping the H2S, which will smell like rotten eggs. The sulfur reducing microbes in the intestine digest the proteins and release the gas.
Egg burps also known as sulfur burps mainly occur when the body expels hydrogen sulfide gas from the stomach. This gas is produced after certain proteins are broken down in the gut. A loud burp may be released but it is usually accompanied by very bad smell and at times, the experience may cause embarrassment.