diff --git a/docs/API_reference/en/iotlib/sms.md b/docs/API_reference/en/iotlib/sms.md
index 96eae3f5ba4928e7bfb061d7f34273813823bfd8..bd8449695fa8af02b55370659058c73edf378bfc 100644
--- a/docs/API_reference/en/iotlib/sms.md
+++ b/docs/API_reference/en/iotlib/sms.md
@@ -419,9 +419,7 @@ SMS center number - Successful execution,String type.
 >>> import sms
 >>> sms.getCenterAddr()
 '+8613800551500'
-# Some series modules may return values without +, such as EC600U series module.
->>> sms.getCenterAddr()
-'8613800551500'
+# If the SMS center number does not contain +, you can query the number and use the default +.
 ```
 
 
diff --git a/docs/API_reference/zh/iotlib/sms.md b/docs/API_reference/zh/iotlib/sms.md
index 2076521db441ccd582ccc17652172823b6e3bb43..af1ef4a6104e6003d0a8a2f4de6b0735ea146d5e 100644
--- a/docs/API_reference/zh/iotlib/sms.md
+++ b/docs/API_reference/zh/iotlib/sms.md
@@ -409,9 +409,7 @@ sms.getCenterAddr()
 >>> import sms
 >>> sms.getCenterAddr()
 '+8613800551500'
-# 有些系列返回值中可能不带+，如EC600U系列：
->>> sms.getCenterAddr()
-'8613800551500'
+# 如果设置的短信中心号码不带+，实际查询和使用默认添加 +
 ```