diff --git a/readme.md b/readme.md
index d034851..ad70896 100644
--- a/readme.md
+++ b/readme.md
@@ -2,11 +2,13 @@
 
 Determine mobile telephone operator from user number (Cameroon)
 
+### Installation
 
-### Installation 
-```composer require malico/mobile-cm-php```
+```bash
+composer require malico/mobile-cm-php
+```
 
-### Usage 
+### Usage
 
 ```php
 
@@ -22,15 +24,23 @@ $phone = '00237653956703';
 // $phone = '653956703';
 
 echo Network::check($phone);
-// nexttel | mtn | orange
+// nexttel | mtn | orange | camtel
 
 if (Network::isOrange($phone)) {
     echo 'Orange';
 }
-// Network::isMTN($phone)
-// Network::isNexttel($phone)
+if (Network::IsNexttel($phone)) {
+    echo 'Nextel';
+}
+
+if (Network::isCamtel($phone)) {
+    echo 'Camtel';
+}
 
 
 ?>
 ```
-Simple. But useful
\ No newline at end of file
+
+Simple. But useful
+
+    * Camtel numbers are tricky. Not sure. Feel feel free to send in a PR for that.
diff --git a/src/Network.php b/src/Network.php
index 129a2ee..6830568 100644
--- a/src/Network.php
+++ b/src/Network.php
@@ -2,37 +2,40 @@
 
 /**
  * @author Malico <hi@malico.me>
- *
  */
+
 namespace Malico\MobileCM;
 
 /**
- * Network
+ * Network.
  */
 class Network
 {
     /**
-     * Country Prefix
+     * Country Prefix.
      */
     const PREFIX = '237';
 
     /**
-     * Operator Prefixes
+     * Operator Prefixes.
      */
     const OPERATOR_PREFIXES = [
         'mtn' => [
-            67, 650, 651, 652, 653, 654, 680, 681, 682, 683
+            67, 650, 651, 652, 653, 654, 680, 681, 682, 683,
         ],
         'orange' => [
-            69, 655, 656, 657, 658, 659
+            69, 655, 656, 657, 658, 659,
         ],
         'nexttel' => [
-            66
-        ]
+            66,
+        ],
+        'camtel' => [
+            '233', '222', '242', '243',
+        ],
     ];
 
     /**
-     * Check if phone is valid length
+     * Check if phone is valid length.
      *
      * @param string|int $tel
      *
@@ -42,7 +45,7 @@ protected static function validLength($tel) : bool
     {
         $len = strlen($tel);
 
-        if ($len == 9 || $len  == 12 || $len = 13 || $len == 14) {
+        if ($len == 9 || $len == 12 || $len = 13 || $len == 14) {
             return true;
         }
 
@@ -50,73 +53,87 @@ protected static function validLength($tel) : bool
     }
 
     /**
-     * Match Tel to Prefix
+     * Match Tel to Prefix.
      *
      * @param string|int $tel
      * @param string $key
      *
      * @return bool
      */
-    protected static function checkNumber($tel, $key)
+    protected static function checkNumber(string | int $tel, $key)
     {
-        if (!self::validLength($tel)) {
+        $tel = \str_replace(' ', '', (string) $tel);
+
+        if (! self::validLength($tel)) {
             return false;
         }
 
         $operator_prefixes = trim(
-            join("|", self::OPERATOR_PREFIXES[$key]),
-            "|"
+            implode('|', self::OPERATOR_PREFIXES[$key]),
+            '|'
         );
-        
-        $expression = "/^((\+|(0{2}))?". self::PREFIX . ")?((". $operator_prefixes . ")([0-9]{6,7}))$/";
+
+        $expression = "/^((\+|(0{2}))?" . self::PREFIX . ')?((' . $operator_prefixes . ')([0-9]{6,7}))$/';
 
         return  preg_match($expression, $tel) ? true : false;
     }
 
     /**
-     * Check if Number is Orange
+     * Check if Number is Orange.
      *
      * @param string | int  $tel
      *
      * @return  bool
      */
-    public static function isOrange($tel) : bool
+    public static function isOrange(string | int $tel) : bool
     {
         return self::checkNumber($tel, 'orange');
     }
 
     /**
-     * Check if Number is MTN
+     * Check if Number is MTN.
      *
      * @param string | int  $tel
      *
      * @return  bool
      */
-    public static function isMTN($tel) : bool
+    public static function isMTN(string | int $tel) : bool
     {
         return self::checkNumber($tel, 'mtn');
     }
 
     /**
-     * Check if Number is Nexttel
+     * Check if Number is Nexttel.
      *
      * @param string | int  $tel
      *
      * @return bool
      */
-    public static function isNexttel($tel) : bool
+    public static function isNexttel(string | int $tel) : bool
     {
         return self::checkNumber($tel, 'nexttel');
     }
 
     /**
-     * Match Number to Operator
+     * Check if Number is Camtel.
+     *
+     * @param   string | int  $tel
+     *
+     * @return  bool
+     */
+    public static function isCamtel(string | int $tel) : bool
+    {
+        return self::checkNumber($tel, 'camtel');
+    }
+
+    /**
+     * Match Number to Operator.
      *
      * @param string | int  $tel
      *
      * @return bool
      */
-    public static function check($tel)
+    public static function check($tel) : string | null
     {
         foreach (self::OPERATOR_PREFIXES as $key => $value) {
             if (self::checkNumber($tel, $key)) {