One thing to note is that, when specifying the external number using the E.164 format, you must encode the leading + as %2B.
需要注意的一点是,在使用 E.164 格式指定外部号码时,必须将前面的 + 编码为 %2B。
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For example, if you need to E-mail a notice to every qualifying account you have on record, then iterating through a list of customer E-mail addresses in XML format is easy to do in an application.