更改方法如下：
一、打开手机，在手机桌面上找到“支付宝”APP图标一项，点击进入。
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https://iknow-pic.cdn.bcebos.com/42a98226cffc1e177f2247ba4490f603728de999"/>
二、进入支付宝后，点击页面右下角的我的一项，然后找到页面右上角的“设置”，点击进入。
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https://iknow-pic.cdn.bcebos.com/f9198618367adab4b4012ccf85d4b31c8601e46d"/>
三、进入后找到“安全设置”一栏，然后点击进入。
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https://iknow-pic.cdn.bcebos.com/c9fcc3cec3fdfc032dc82933da3f8794a5c2268d"/>
四、进入到安全设置以后，找到“手机号”一栏，点击进入。
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https://iknow-pic.cdn.bcebos.com/f636afc379310a555db9157fb94543a983261098"/>
五、进入后输入新的手机号码，验证后就更改了支付宝的手机号码。
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https://iknow-pic.cdn.bcebos.com/1b4c510fd9f9d72a5e7f2691da2a2834349bbb26"/>