diff --git a/src/carrier.rs b/src/carrier.rs
index 8207b27..8e1f2ac 100644
--- a/src/carrier.rs
+++ b/src/carrier.rs
@@ -14,34 +14,69 @@
 
 use serde_derive::{Deserialize, Serialize};
 use std::fmt;
-use std::ops::Deref;
+
+use crate::ParseError;
 
 /// A phone number carrier.
+///
+/// See: https://en.wikipedia.org/wiki/Mobile_country_code#National_operators
 #[derive(Clone, Eq, PartialEq, Serialize, Deserialize, Hash, Debug)]
-pub struct Carrier(pub(crate) String);
-
-impl<T: Into<String>> From<T> for Carrier {
-    fn from(value: T) -> Carrier {
-        Carrier(value.into())
-    }
+pub struct Carrier {
+    pub mcc: u16, // always 3 digits
+    pub mnc: u16, // 2 or 3 digits
+    pub mnc_3: bool,
 }
 
-impl Deref for Carrier {
-    type Target = str;
+impl TryFrom<&str> for Carrier {
+    type Error = ParseError;
 
-    fn deref(&self) -> &str {
-        &self.0
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        Ok(Self {
+            mcc: value
+                .get(0..3)
+                .and_then(|c| c.parse().ok())
+                .ok_or(ParseError::InvalidCountryCode)?,
+            mnc: value
+                .get(3..)
+                .and_then(|c| c.parse().ok())
+                .ok_or(ParseError::InvalidNetworkCode)?,
+            mnc_3: value.len() == 6,
+        })
     }
 }
 
-impl AsRef<str> for Carrier {
-    fn as_ref(&self) -> &str {
-        &self.0
+impl fmt::Display for Carrier {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if self.mnc_3 {
+            write!(f, "{:03}{:03}", self.mcc, self.mnc)
+        } else {
+            write!(f, "{:03}{:02}", self.mcc, self.mnc)
+        }
     }
 }
 
-impl fmt::Display for Carrier {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.0)
+#[cfg(test)]
+mod test {
+    use super::Carrier;
+    use std::convert::TryInto;
+
+    #[test]
+    fn test_mobile_network_codes() {
+        assert_eq!(
+            Carrier {
+                mcc: 336,
+                mnc: 1,
+                mnc_3: true
+            },
+            "336001".try_into().unwrap()
+        );
+        assert_eq!(
+            Carrier {
+                mcc: 336,
+                mnc: 35,
+                mnc_3: false
+            },
+            "33635".try_into().unwrap()
+        );
     }
 }
diff --git a/src/error.rs b/src/error.rs
index 2cbcf72..6fe8d62 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -58,12 +58,16 @@ pub enum Parse {
     #[allow(unused)] // This is unused in the build script
     NoNumber,
 
-    /// The country code supplied did not belong to a supported country or
-    /// non-geographical entity.
+    /// The country code supplied is not correct.
     #[error("invalid country code")]
     #[allow(unused)] // This is unused in the build script
     InvalidCountryCode,
 
+    /// The network code supplied is not correct
+    #[error("invalid network code")]
+    #[allow(unused)] // This is unused in the build script
+    InvalidNetworkCode,
+
     /// This indicates the string started with an international dialing prefix,
     /// but after this was stripped from the number, had less digits than any
     /// valid phone number (including country code) could have.
diff --git a/src/formatter.rs b/src/formatter.rs
index 999aa0e..48f1d91 100644
--- a/src/formatter.rs
+++ b/src/formatter.rs
@@ -16,6 +16,7 @@ use crate::{
     consts,
     metadata::{Database, Format, Metadata, DATABASE},
     phone_number::PhoneNumber,
+    Carrier,
 };
 use std::{borrow::Cow, fmt};
 
@@ -234,7 +235,7 @@ fn replace(
     meta: &Metadata,
     formatter: &Format,
     transform: Option<&str>,
-    carrier: Option<&str>,
+    carrier: Option<&Carrier>,
 ) -> String {
     formatter
         .pattern()
@@ -249,7 +250,11 @@ fn replace(
                     .as_str();
                 let format = transform.replace(consts::NP, meta.national_prefix().unwrap_or(""));
                 let format = format.replace(consts::FG, &format!("${}", first));
-                let format = format.replace(consts::CC, carrier.unwrap_or(""));
+                let format = if let Some(carrier) = carrier.map(|c| c.to_string()) {
+                    format.replace(consts::CC, &carrier)
+                } else {
+                    format.replace(consts::CC, "")
+                };
 
                 consts::FIRST_GROUP.replace(formatter.format(), &*format)
             } else {
diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index 85d0fd6..9acbeda 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -12,7 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use crate::carrier::Carrier;
+use std::borrow::Borrow;
+
 use crate::consts;
 use crate::country;
 use crate::error;
@@ -89,7 +90,10 @@ pub fn parse_with<S: AsRef<str>>(
         )?,
 
         extension: number.extension.map(|s| Extension(s.into_owned())),
-        carrier: number.carrier.map(|s| Carrier(s.into_owned())),
+        carrier: number.carrier.and_then(|s| {
+            let s: &str = s.borrow();
+            s.try_into().ok()
+        }),
     })
 }
 
@@ -262,7 +266,7 @@ mod test {
                 national: NationalNumber::new(3121286979, 0).unwrap(),
 
                 extension: None,
-                carrier: Some("12".into()),
+                carrier: "12".try_into().ok(),
             },
             parser::parse(Some(country::BR), "012 3121286979").unwrap()
         );