Cuba WhatsApp Full-Format Screening Tutorial

The international area code for Cuba is+53, Cuban phone number is8 digits, mainstream5Beginning. Overseas dialing is written in international format as+53 5 123 4567, locally in Cuba, just dial the 8-digit number, the number itselfNo lead 0。 It is important to note that international calls from Cuba use prefixes119, rather than the usual ones00Or011。 When cleaning data, the format should be standardized to E.164+5351234567, then remove spaces, brackets, lines, and unnecessary prefixes, verify the 8-bit length, and finally remove duplicates according to the unified signature.

Quick reference table for Cuban mobile phone number formats

Project	Explanation	Example
Country/Region	Republic of Cuba	Cuba
International area code	+53	+53
Mobile phone number length	8-digit numbers (excluding area code and country code)	51234567
Phone numbers often start with the same number	With5The beginning is the main reference; the specific number range is subject to ETECSA’s publication	5 123 4567
Anyway, for reference	Havana Classical Dialect is usually written as:7Beginning: Ru7 123 4567	+53 7 123 4567
International format example	53 8-digit numbers	+53 5 123 4567
E.164 format example	Remove spaces and separators	+5351234567
Local calls from Cuba to mobile phones	Dial 8 digits directly	5123 4567
Calling Cuba from China	00 53 8 digits	00 53 5 123 4567
Calling from the United States/Canada	011 53 8 digits	011 53 5 123 4567
Calls from Cuba to international destinations	119 Country Code: Local Number	119 86 10 1234 5678

The Cuban telecom operator isETECSA, and also Cuba’s main basic telecom service provider. The specific scope of mobile number and fixed-line range openings will be adjusted according to carrier planning. Before the cleansing rules go live, it is recommended to refer to the current official ETECSA announcements.

International format vs. local format

The same Cuban phone number can be written differently depending on the scenario:

Scene	Writing style	Explanation
International Standard E.164	+5351234567	Used for database storage and API validation
International readable format	+53 5 123 4567	Used for display and form filling
Chinese user habits	00 53 5 123 4567	00It is an international outgoing prefix, not part of the number
American users are used to it	011 53 5 123 4567	011It is a prefix used by North American international calls
Local Cuban display	5 123 4567	Local dial-up does not require a country code

Cleaning principles:Just take it+53The 8 digits following are considered the valid number body, the front one00、011、119, spaces, brackets, and blanks all belong to ‘dialing expression’ and should be standardized as+。

Prerequisite 0: Cuban numbers should not be casually added to 0

Many countries, such as China and Japan, have domestic phone numbers with a leading zero, for example0138...。 But Cuba’s mobile phone number systemWithout this precursor 0Local dialing also directly uses 8-digit numbers.

Common errors in data import include:

Original writing	Problem	After cleaning
05351234567	There was one more left0	+5351234567
053 5 123 4567	There was one more left0	+5351234567
0053 5 123 4567	00It is an international prefix, not a local Cuban serial number	+5351234567

Handling rules: If the number appears as ‘s’ or ‘s’0For the opening situation, let’s first judge the following content:

• 00Country codes, for example0053..., and00Turned into a bridge+；
• 0 + 53, for example053..., remove the lead0, reserved53；
• 0Not the back53, it could be a number from another country or dirty data, so don’t blindly add it53。

Numbers, 00, 011, 119

The most easily confused part of Cuban number washing is the international call prefix.

Prefix	Used for	Example	Cleaning and treatment
+	Internationally recognized prefix E.164	+5351234567	Reserve
00	Most countries like China and Europe use international prefixes	0053 5 123 4567	Replace with+
011	The United States and Canada internationally pronounce prefixes	011 53 5 123 4567	Replace with+
119	Cuba itselfInternational call prefixes	119 53 5 123 4567	Replace with+

Special note: Cuba’s international exhalation prefix is119, instead00。 If seen in internal systems or call logs119 53 5123 4567, usually a record left after someone calls Cuban numbers internationally from Cuba, and should be processed as standardized when it comes to normalization+5351234567。

How to handle spaces, parentheses, and hyphens

Cuban numbers do not have a mandatory requirement to use any particular separator. In practice, the following formats may appear:

+53 5 123 4567
+53-5-123-4567
(53) 5123 4567
+53 (5) 123 4567
53 5 123 4567

All these ways of writing express the same number5351234567When cleaning, it is done in two steps uniformly:

1. Remove all spaces, parentheses, hyphens, and periods;
2. Keep only+And numbers.

Example:

(53) 5123-4567
→ 5351234567
→ +5351234567

In Excel, how to restore when it becomes E 09 / E 11

Excel by default saves numbers that exceed a certain length as ‘values’, and when the column width is insufficient, they will be displayed in scientific notation:

Actual deposited content	Excel Display	Reason
5351234567(10 digits)	5.35123E+09	The pure number is too long, so it is converted into scientific notation
0053511234567(12-digit number)	5.35112E+11	Leading zeros are discarded, and numbers are displayed in scientific notation

here’sE+09、E+11It’s just a display format and does not mean the number actually becomes smaller. However, if the column type is not handled properly when exporting to CSV later, the number might turn into5351234567This incomplete form even loses the final position.

Avoidance methods:

• The numbers in Excel are set to ‘Text’ format in advance.
• Add an English single quote at the beginning when entering in a cell', for example'5351234567；
• If it has already changed from a number to scientific notation, use a formula to restore the text:

=IF(ISNUMBER(A1), TEXT(A1,"0"), A1)

This formula will restore the number into a complete numeric string, and then supplement it.+：

=IF(LEFT(A1,1)="+", A1, "+"&TEXT(A1,"0"))

Like this5351234567will become+5351234567。

How to identify and remove duplicate numbers

When cleaning and deduplicating Cuban numbers, you cannot directly compare the original strings, because the same number may have multiple formats:

+53 5 123 4567
5351234567
0053 5 123 4567
+53-5-123-4567
(53) 5123 4567
5 123 4567
0535 123 4567

Standardize first, then remove duplicates:

Line number	Raw data	Standardized Signature	Judgment
1	+53 5 123 4567	CU+5351234567	Reserved
2	0053 5123 4567	CU+5351234567	Repeat
3	+53-5-123-4567	CU+5351234567	Repeat
4	(53) 5123 4567	CU+5351234567	Repeat
5	5 123 4567	CU+5351234567	Repeat, complete the country code
6	0535 123 4567	CU+5351234567	Repeat, remove leading 0
7	5 123 4568	CU+5351234568	New number, reserved

Recommended signature rules:

ISO Country Code E.164 Number
CU 5351234567

Only when standardized signatures are completely identical is it considered a duplicate.

How to troubleshoot incorrect country code

Cuba area code+53Easily confused with the area codes of other Latin American countries, especially Brazil+55, Argentina+54, Mexico+52, USA/Canada+1。 Be alert when the following situations appear in the data:

Raw data	Actual possibility	Problem
1-512-345-6789	U.S. Number (Texas Area Code 512)	Not a Cuban number
+55 5123 4567	Brazil direction	The country code was mistakenly written as Brazil55
+52 5123 4567	Mexico direction	The country code was mistakenly written as Mexico52
5123456789	It could be a US number, or it could be dirty data	You can’t blindly supplement it+53

Core idea for identifying incorrect country codes:

1. Check if the original data has a clear country code;
2. If you have a country code, match it first and don’t force it to replace it+53；
3. If there is no country code, if the number is 8 digits and is set to5The beginning can be supplemented+53；
4. If there is no country code but the length is not 8 digits, mark it as manual verification, do not add automatically53；
5. When multiple country code candidates are available, priority is given to using the Front Guide0、00、011、119and other dial-up leads to determine the origin location;
6. If the number is used for platforms like WhatsApp or Telegram, it can be cross-verified through number status checks under authorization compliance.

Standardized cleaning procedures

It is recommended to write the Cuban number cleaning process as a fixed process to avoid manual handling every time:

Step 1: Remove the spaces at the beginning and end, and hide the characters
Step 2: Remove spaces, brackets, lines, and dots
Step 3: Unify international prefixes
 00 → 
 011 → 
 119 → 
 If already has , keep it
Step 4: Remove the excess leading zeros
 053... → 53... 
Step 5: Complete the country code
 8 digits starting with 5 → plus 53
 10 digits starting with 53 plus → 
Step 6: Verify the length
 53 must be followed by an 8-digit number
 Not 8-bit → marked as an exception
Step 7: Output deduplication signature
 CU 53 8-digit numbers

Corresponding decision table:

Current status	Handling the action	Output
Already+The beginning	Keep and remove non-digital items	+5351234567
With00The beginning	00Replace with+	+5351234567
With011The beginning	011Replace with+	+5351234567
With119The beginning and the rest are53	119Replace with+	+5351234567
With0The beginning and the rest are53	Removed0	+5351234567
Only 8 digits, starting with 5 or 7	Supplement+53	+5351234567
There are only 10 characters, starting with 53	Supplement+	+5351234567
Other lengths or prefixes	Mark as abnormal	Wait for manual review

Before / After Cleaning Comparison

Scene	Raw CSV data	Standardized results	Explanation
Standard international format	+53 5 123 4567	+5351234567	Remove the spaces
Missing number	5351234567	+5351234567	Supplement+
00 prefix	00 53 5123 4567	+5351234567	00Transfer+
011 Prefix	011 53 5 123 4567	+5351234567	011Transfer+
119 prefix	119 53 5 123 4567	+5351234567	Records of international calls from Cuba
Preface 0	053 5 123 4567	+5351234567	Removed0
Cuba local number	5 123 4567	+5351234567	Supplement the national code
Local compact number	51234567	+5351234567	Supplement the national code
Havana Gus	7 123 4567	+5371234567	Must be marked as a landline; cannot be used as a phone filter
Mistaken for a US number	5123456789	No automatic replacement+53	A 10-digit number, probably not a Cuban number
Non-Cuban country code	+55 5123 4567	Do not process as Cuban numbers	If the country code differs, check according to Brazil’s direction

CSV field suggestions

It is recommended to retain at least the following fields in the cleaned Cuban number data:

field name	Meaning	Example
raw_phone	Original number	(53) 5123-4567
phone_e164	E.164 Standard Number	+5351234567
country	ISO country code	CU
number_type	Mobile / Landline / Unknown	mobile
clean_status	Cleaning condition	valid / invalid / review

Recommended output format unified use:

raw_phone,phone_e164,country,number_type,clean_status
"(53) 5123-4567",+5351234567,CU,mobile,valid
05351234567,+5351234567,CU,mobile,valid
7 123 4567,+5371234567,CU,landline,valid
5123456789,,US,unknown,review

Using AppShai AppShai to process Cuban number data

If it’s just a small number of numbers, just use Excel rules to handle it. If you have a whole batch of Cuban numbers or cross-border CRM data, a safer approach is: first standardize and remove country codes, then filter for activation, activity, and online status of numbers, avoiding spending energy on invalid numbers.

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