61Cautions.Any changes or modifications to your Sprint PCS Phone notexpressly approved in this document could void your warranty forthis equipment and void your authority to operate this equipment.Only use approved batteries, antennas and chargers. The use ofany other type will invalidate the warranty.FCC notice.The phone may cause TV or radio interference if used in closeproximity to receiving equipment. The FCC can require you to stopusing the telephone if such interference cannot be eliminated. Ifyou need assistance, contact Sprint PCS Customer Care.And last, but certainly not least, vehicles using liquefiedpetroleum gas (such as propane or butane) must comply with theNational Fire Protection Standard (NFPA-58). For a copy of thisstandard, contact the National Fire Protection Association,One Batterymarch Park, Quincy, MA 02269, Attn: PublicationSales Division.