The United Kingdom. This is a mobile phone.
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.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
Country code +57 is Colombia.
Country code 52 is Mexico.
Fiji has telephone country code +679.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Vanuatu is country code +678.
Niue is country code +683.