Telephone country code +971 is the United Arab Emirates, and a number beginning with +971 55 is a mobile on the Du network.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
That is not a valid mobile number. There is no country code starting with a sequence of zeros.
In a mobile number, "44" is the country code for the United Kingdom. It is used when dialing UK numbers from abroad, indicating that the call is being routed to the UK. For example, if you see a mobile number starting with +44, it signifies that the number is registered in the UK.
Country code +60 is Malaysia, but a number beginning with +60 4 is a geographic number (i.e., a landline), not a mobile.
That's not a valid number.
Country code +503 is El Salvador, and +503 720 xxxxx is a mobile number.
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Country code +233 is Ghana, and a number beginning +233 20 is a mobile.
The phone number 07984589405 does not have a specific country code associated with it as it is a mobile phone number. It could potentially belong to any country that uses a similar format for mobile phone numbers, such as the UK.
The mobile number +63 938 068 5228 indicates that it is a mobile phone number in the Philippines. The country code +63 is for the Philippines, and the number starts with 938, which typically designates a specific mobile network provider. The format follows the standard mobile numbering system in the country.
Country code +39 is Italy, and +39 392 is an H3G mobile
The telephone code 44777 is not a country code but rather a mobile phone number prefix used in the United Kingdom. In the UK, numbers starting with 447 are typically mobile numbers that begin with the international dialing code for the UK, which is +44. The specific format of 44777 indicates a mobile service provider.
The easiest way to store numbers on your mobile is in international format. In the case of Tunisia, start with country code +216, including the plus sign. The mobile network will then insert the appropriate prefix, wherever you are calling from. If you store the number starting with 00216, your call or text may be misrouted if you are roaming in a country that uses a different international access prefix.