各位大佬：咨询下gv号绑定AE alerts的事刚拿到美国运通卡，在运通app上操作enroll手机号（用的google voice号，这个号收app登陆二次验证码没问题）准备用来接收alerts，app上输入了csc，pin等一顿验证后，收到短信：Reply YES to confirm enrollment in Amex Account Alerts. Msg&Data rates may apply. Msg freq varies by acct and prefs. Txt HELP for info.回复yes，什么反映都没有，也没enroll上；回复help，系统反馈了一条短信“For more info on Amex Alerts visit americanexpress.com/accountalerts. Msg&Data rates may apply. Msg freq varies by acct & prefs. Txt STOP to cancel.”请问各位大佬，如何才能正确enroll上啊？
