因為安全需要。
短信驗證為了保護個人用戶的資金安全設置的措施，但壹般情況下是不會用到的，除非大額度的轉賬才能有意義的用到。
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擴展資料：
取消短信驗證步驟：
1、打開手機微信，登錄進入主界面，點擊我，之後點擊下方的設置進入設界面，點擊下方賬號與安全。
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3、之後可以看到微信安全中心選項，點擊進入，點擊上方關閉賬號保護。
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5、進入驗證信息界面，輸入手機號，此時按照提示，發送相關指令，發送到指定號碼，點擊我已發送即可。
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