微信号只能设置一次，微信号设置规则为：字母开头，6~20个字母、数字、下划线和减号。因为手机号是数字开头，所以无法将微信号改成手机号。
设置微信号的方式如下：
1、在手机中，找到微信app，点击打开；
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2、进入微信主界面，在下方标签栏中点击“我”；
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3、点击微信头像区域，进入个人信息页面；
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4、在个人信息页面，点击微信号，进入设置微信号页面；
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5、在设置微信号页面，根据微信号规则设置即可。
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如果是希望对方通过搜索手机号添加到你，那么只需将微信绑定手机号即可，方法如下：
1、在微信“我”标签下点击设置一栏，进入设置页；
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2、在设置页面，点击帐号与安全一栏，进入对应界面；
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3、在帐号与安全页面，查看手机号，针对未绑定的微信号，可绑定手机号；
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4、点击手机号进入绑定手机号页面，进行绑定手机号操作；
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5、再次进入设置页，点击隐私，进入隐私页，点击添加我的方式；
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https://iknow-pic.cdn.bcebos.com/9c16fdfaaf51f3deda179a3899eef01f3b2979c0"/>
6、可通过以下方式搜索到我中，将手机号方式打开即可。
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