diff --git a/config.sample.json b/config.sample.json
index b7a5a7d..cd222b5 100644
--- a/config.sample.json
+++ b/config.sample.json
@@ -15,7 +15,7 @@
         "listen_port": "2110"
     },
     
-    "interval_beetwen_signal_strength_ms": 60000,
+    "interval_beetwen_signal_strength_ms": 30000,
     "sleep_after_send_sms_ms": 2000,
     "disable_delete_inbox_on_startup": false
 }
\ No newline at end of file
diff --git a/lib/modem.js b/lib/modem.js
index 06977fc..31a66bc 100644
--- a/lib/modem.js
+++ b/lib/modem.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const DEFAULT_SLEEP_AFTER_SEND_SMS_MS = 2000;
-const INTERVAL_BEETWEN_SIGNAL_STRENGTH_MS = 60000;
+const INTERVAL_BEETWEN_SIGNAL_STRENGTH_MS = 30000;
 const MAX_LAST_DATA_AGE_MS = 3 * 60 * 1000;
 const REGEX_WAIT_FOR_OK_OR_ERROR = /\n(?:OK|ERROR)\r/;
 // const REGEX_WAIT_FOR_OK_OR_ERROR_USSD = /\n(?:OK|ERROR)\r/;