Message Blink automatically converts phone numbers into the international E.164 format, ensuring compatibility with global SMS and WhatsApp carriers. Proper formatting is critical because telecom providers reject messages sent to incorrectly formatted numbers.
What Is E.164 Format? #
E.164 is the international phone number standard defined by the ITU.
A valid E.164 number:
- Always starts with a +
- Includes a country code
- Contains no spaces, dashes, or special characters
- Has a maximum of 15 digits
Example:
+14155551234
Country Specific Formatting Rules #
1. 
United States (US) #
Country Code- +1
National Number Length- 15
Accepted Inputs & Auto-Conversion
10-digit number
- Message Blink adds +1
- Example:
4155551234 → +14155551234
11-digit number starting with 1
- Message Blink prefixes +
- Example:
14155551234 → +14155551234
2. 
United Kingdom (UK) #
Accepted Inputs & Auto-Conversion
Country Code- +44
National Number Length- 10 Digits (without leading 0)
Accepted Inputs & Auto-Conversion #
10-digit number
- Automatically converted to +44
- Example:
7123456789 → +447123456789
11-digit number starting with 0
- Leading 0 is removed and replaced with +44
- Example:
07123456789 → +447123456789
12-digit number starting with 44
- Message Blink adds +
- Example:
447123456789 → +447123456789
3. 
Australia (AU) #
Country Code- +61
National Number Length- 9 Digits (without leading 0)
Accepted Inputs & Auto-Conversion
9-digit number
- Message Blink adds +61
- Example:
423456789 → +61423456789
10-digit number starting with 0
- Leading 0 is removed and replaced with +61
- Example:
0423456789 → +61423456789
4. 
Sweden (SE) #
Country Code- +46
National Number Length- 9 Digits (without leading 0)
Accepted Inputs & Auto-Conversion #
9-digit number
- Message Blink adds +46
- Example:
701234567 → +46701234567
