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.
The smell of sulfur (sulphur) or rotten egg burps comes from hydrogen sulfide (H2S), a gas originating from sulfur-containing proteins in certain foods (see below) after they are broken down in the stomach or small intestine by sulfur-reducing microbes. These microbes may be normal intestinal bacteria or pathogenic bacteria.