换了手机卡，原来绑定的支付宝还能用的，换了手机卡最好还是把支付宝绑定的手机号修改为新的手机号。
修改绑定手机号码操作如下：
1、在手机上打开支付宝APP，登录支付宝账号后，点击右下角【我的】。
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2、进入我的界面红藕，选择右上角【设置】，然后点击【安全设置】。
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3、进入安全设置界面，在菜单栏中找到【手机号】，并点击进入。
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4、进入手机号页面后，显示原来绑定的旧手机号码，点击下方的【更换手机号】。
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5、进入新页面后，在【新手机号】位置输入新换的手机卡的号码，点击下一步。
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6、按照提示发送校验码到新手机号上，然后输入接收到的短信校验码，点击下一步。
7、接下来进入到【正在进行智能安全检测??】页面，等待检测完成。
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8如果检测到在常用的网络\设备\位置下操作，就是通过身份验证，点击【验证支付密码】输入正确的支付密码后，就成功修改绑定的手机号码了。
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参考资料来源：/cshall.alipay.com/lab/help_detail.htm?help_id=560318&keyword=%D6%A7%B8%B6%B1%A6%B0%F3%B6%A8%CA%D6%BB%FA%B8%FC%BB%BB&sToken=s-cef0d7ed9d2e4f799eea244309b44989&from=search&flag=0"target="_blank"title="只支持选中一个链接时生效">支付宝服务大厅-手机登录支付宝，如何修改绑定手机