Turn off your phone when refueling. There are often warnings against the use of cell phones at gas stations. cell phone jammer
When using the opposite frequency to the cell phone, cell phone jammers can severely disrupt the communication between the caller and the receiver. Effectively blocks signal transmission from UMTS, 3G, CDMA, GSM and PHS. Mobile phones use different frequency bands in different countries. The 1900 MHz band is a secondary frequency band in Germany, especially in urban areas. 850 MHz for local backup. These frequencies are also used in the Middle East, Africa, Asia and Oceania. In Russia and several other countries, foreign operators have 450MHz frequency licenses to provide CDMA coverage.Buying an old fashioned cell phone blocking kit is the latest and wisest advice for cell phone users and service station workers.