19Health and safety informationOther Important Safety Information• Only qualified personnel should service the device or install thedevice in a vehicle. Faulty installation or service may be dangerousand may invalidate any warranty applicable to the device.• Check regularly that all device equipment in your vehicle ismounted and operating properly.• Do not store or carry flammable liquids, gases or explosivematerials in the same compartment as the device, its parts oraccessories.• For vehicles equipped with an air bag, remember that an air baginflates with great force. Do not place objects, including bothinstalled or portable wireless equipment in the area over the air bagor in the air bag deployment area. If wireless equipment isimproperly installed and the air bag inflates, serious injury couldresult.• Switch your device off before boarding an aircraft. The use of devicein aircraft is illegal and may be dangerous to the aircraft'soperation.Failure to observe these instructions may lead to the suspension ordenial of telephone services to the offender, or legal action, or both.Product PerformanceGetting the Most Out of Your Signal ReceptionThe quality of each call you make or receive depends on the signalstrength in your area. Your device informs you of the current signal