Use wifi more. Now wifi is very popular. Hotels, restaurants, banks, companies and even subways and buses have wifi, so we should use these public resources more in our daily life. Especially when your mobile phone traffic is not enough, you need to rub wifi. Moreover, in order to facilitate the use of mobile phones, wireless routers can also be installed at home, so that mobile phones at home can also use wifi to access the Internet, saving mobile phone traffic.