diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 85690ac7c12158024cf211fd17e2035df75d584e..52c965fb0051a4bf78e805691c98f4befd0a3551 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -135,13 +135,15 @@ function getBrowserInfo($user_agent)
 	$name='unknown';
 	$version='';
 	$os='unknown';
-	$phone = 'unknown';
+	$phone = '';
 
 	$detectmobile = new MobileDetect(null, $user_agent);
 	$tablet = $detectmobile->isTablet();
 
 	if ($detectmobile->isMobile()) {
 
+		$phone = 'unknown';
+
 		// If phone/smartphone, we set phone os name.
 		if ($detectmobile->is('AndroidOS')) {
 			$os = $phone = 'android';
diff --git a/test/phpunit/FunctionsLibTest.php b/test/phpunit/FunctionsLibTest.php
index 65a97881a782a6585c83a4d7034040d7165972b2..f26849231260b79a5555b261e50e2923ac0699ae 100755
--- a/test/phpunit/FunctionsLibTest.php
+++ b/test/phpunit/FunctionsLibTest.php
@@ -131,7 +131,7 @@ class FunctionsLibTest extends PHPUnit_Framework_TestCase
         $tmp=getBrowserInfo($user_agent);
         $this->assertEquals('ie',$tmp['browsername']);
         $this->assertEquals('5.0',$tmp['browserversion']);
-	    $this->assertFalse($tmp['phone']);
+	    $this->assertEmpty($tmp['phone']);
 	    $this->assertFalse($tmp['tablet']);
 	    $this->assertEquals('classic', $tmp['layout']);
 
@@ -140,7 +140,7 @@ class FunctionsLibTest extends PHPUnit_Framework_TestCase
         $tmp=getBrowserInfo($user_agent);
         $this->assertEquals('firefox',$tmp['browsername']);
         $this->assertEquals('0.9.1',$tmp['browserversion']);
-	    $this->assertFalse($tmp['phone']);
+	    $this->assertEmpty($tmp['phone']);
 	    $this->assertFalse($tmp['tablet']);
 	    $this->assertEquals('classic', $tmp['layout']);
 
@@ -148,7 +148,7 @@ class FunctionsLibTest extends PHPUnit_Framework_TestCase
         $tmp=getBrowserInfo($user_agent);
         $this->assertEquals('opera',$tmp['browsername']);
         $this->assertEquals('6.03',$tmp['browserversion']);
-	    $this->assertFalse($tmp['phone']);
+	    $this->assertEmpty($tmp['phone']);
 	    $this->assertFalse($tmp['tablet']);
 	    $this->assertEquals('classic', $tmp['layout']);
 
@@ -156,7 +156,7 @@ class FunctionsLibTest extends PHPUnit_Framework_TestCase
         $tmp=getBrowserInfo($user_agent);
         $this->assertEquals('chrome',$tmp['browsername']);
         $this->assertEquals('19.0.1042.0',$tmp['browserversion']);
-	    $this->assertFalse($tmp['phone']);
+	    $this->assertEmpty($tmp['phone']);
 	    $this->assertFalse($tmp['tablet']);
 	    $this->assertEquals('classic', $tmp['layout']);
 
@@ -164,7 +164,7 @@ class FunctionsLibTest extends PHPUnit_Framework_TestCase
         $tmp=getBrowserInfo($user_agent);
         $this->assertEquals('chrome',$tmp['browsername']);
         $this->assertEquals('17.0.963.56',$tmp['browserversion']);
-	    $this->assertFalse($tmp['phone']);
+	    $this->assertEmpty($tmp['phone']);
 	    $this->assertFalse($tmp['tablet']);
 	    $this->assertEquals('classic', $tmp['layout']);
 
@@ -172,7 +172,7 @@ class FunctionsLibTest extends PHPUnit_Framework_TestCase
         $tmp=getBrowserInfo($user_agent);
         $this->assertEquals('safari',$tmp['browsername']);
         $this->assertEquals('533.21.1',$tmp['browserversion']);
-	    $this->assertFalse($tmp['phone']);
+	    $this->assertEmpty($tmp['phone']);
 	    $this->assertFalse($tmp['tablet']);
 	    $this->assertEquals('classic', $tmp['layout']);
 
@@ -181,7 +181,7 @@ class FunctionsLibTest extends PHPUnit_Framework_TestCase
 	    $tmp=getBrowserInfo($user_agent);
 	    $this->assertEquals('ie',$tmp['browsername']);
 	    $this->assertEquals('11.0',$tmp['browserversion']);
-	    $this->assertFalse($tmp['phone']);
+	    $this->assertEmpty($tmp['phone']);
 	    $this->assertFalse($tmp['tablet']);
 	    $this->assertEquals('classic', $tmp['layout']);