00 isn't part of the country code, it is a commonly used international access prefix.
Telephone country code +49 is Germany. +49 61 is an incomplete area code in the Rhine-Main area. You need 1 or 2 more digits to be more specific.
(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.)
There is not a country that has a phone number starting with 54321. The number does come up on some calls, but has been reported as a scam.
That is not a valid mobile number. There is no country code starting with a sequence of zeros.
The phone number for contacting businesses in Singapore is typically a local number starting with the country code 65.
That's a UK number - HOWEVER - numbers starting with 06 in the UK are not in use yet.
A VIN (Vehicle Identification Number) starting with the number "4" indicates that the vehicle was manufactured in the United States. The first character of the VIN represents the country of origin, and in this case, "4" is specifically assigned to vehicles made by Ford in the U.S. This coding system helps identify the manufacturer and the country of production.
The starting check number for check number 101 is 100.
The country code +44 is for the United Kingdom. The area code 01722 specifically corresponds to Salisbury, a city in Wiltshire, England. Therefore, a phone number starting with +44 01722 would be a local number in Salisbury.
The largest country in terms of population starting with the letter "A" is Afghanistan.
Belgium
Afghanistan
Djiboti
The starting check number for Walmart is typically 1000.