def get_company(phone):
prefix = phone[:3]
cm = ['134','135','136','137','138','139','150','151','152','157','158','159','182','183','184','187','188','147','178','198','148','165','170','172','178','197']
cu = ['130','131','132','155','156','185','186','145','176','166','146','167','170','171','175','195','196']
ct = ['133','153','180','181','189','177','199','193','141','149','162','165','170','173','174','190','191']
gd = ['192']
if prefix in cm:
return "中国移动"
elif prefix in cu:
return "中国联通"
elif prefix in ct:
return "中国电信"
elif prefix in gd:
return "中国广电"
else:
return "未知运营商"
phone = "13812345678"
company = get_company(phone)
print(f"手机号 {phone} 的运营商是: {company}") 

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