diff --git a/app/src/main/res/values-en/strings.xml b/app/src/main/res/values-en/strings.xml
index a43e1a73..7d2aa7cb 100644
--- a/app/src/main/res/values-en/strings.xml
+++ b/app/src/main/res/values-en/strings.xml
@@ -780,7 +780,7 @@
     <string name="phone_numbers">Phone Numbers</string>
     <string name="phone_numbers_hint">Required, separate multiple phone numbers with semicolons</string>
     <string name="phone_numbers_error">Invalid Phone Numbers, eg. 15888888888;19999999999</string>
-    <string name="phone_numbers_regex">^\\d{5,11}(;\\d{5,11})*$</string>
+    <string name="phone_numbers_regex">^\\d{5,20}(;\\d{5,20})*$</string>
     <string name="msg_content">Msg Content</string>
     <string name="msg_content_hint">Required, one entry within 70 characters, more than 70 characters, one entry for every additional 64 characters</string>
     <string name="msg_content_error">Msg Content cannot be empty, up to 390 characters (6 SMS)</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d24849bd..c28106d4 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -781,7 +781,7 @@
     <string name="phone_numbers">手机号码</string>
     <string name="phone_numbers_hint">必填，多个手机号用半角分号分隔</string>
     <string name="phone_numbers_error">手机号码格式错误，例：15888888888;19999999999</string>
-    <string name="phone_numbers_regex">^\\d{5,11}(;\\d{5,11})*$</string>
+    <string name="phone_numbers_regex">^\\d{5,20}(;\\d{5,20})*$</string>
     <string name="msg_content">短信内容</string>
     <string name="msg_content_hint">必填，70个字符内算一条，超过70个字符，每增加64字符累加1条</string>
     <string name="msg_content_error">短信内容不能为空，最多390字符（6条短信）</string>