diff --git a/Tests.st b/Tests.st
index 7742d0b..8df7f43 100644
--- a/Tests.st
+++ b/Tests.st
@@ -950,12 +950,19 @@ TestCase subclass: GSMNumberDigitsTest [
         number := #(73 132 50 23 120 186 220 174).
         res := GSMNumberDigits decodeFrom: number.
         self assert: res = '9448237187*#abc*'.
+
+        number := #(114 4 8 0 0 48 0 240).
+        res := GSMNumberDigits decodeFrom: number.
+        self assert: res = '274080000003000'.
     ]
 
     testEncodeFrom [
         | res |
         res := GSMNumberDigits encodeFrom: '9448237187*#abc*'.
         self assert: res = #(73 132 50 23 120 186 220 174) asByteArray.
+
+        res := GSMNumberDigits encodeFrom: '274080000003000'.
+        self assert: res = #(114 4 8 0 0 48 0 240) asByteArray.
     ]
 
 ]