可以在支付宝手机客户端直接修改
修改手机号码的流程：
1 手机登录支付宝，点击右下角【我的】
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2 选择右上角【设置】
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3 选择【手机号】
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4 点击【更换手机号】
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5 输入新手机号码
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6 输入接收到的短信校验码
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7 进行智能安全检测
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8 如果检测到在常用的网络\设备\位置下操作，通过身份验证，可以点击【下一步】，直接修改手机
如果检测到非上述环境下操作，需要进行身份验证（如人脸校验、回答安全保护问题、手机校验码等，具体验证方式，以前台显示为准）
若所有校验方式都无法通过，页面会提示联系在线客服，也可以在电脑端登录支付宝，选择【通过人工服务】回答问题/提交相应身份证件申请修改手机
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9 验证成功，修改手机成功