Country code +252 is Somalia, but that does not appear to be a valid number. Numbers beginning with +252 3 are landlines in the area of Kisimaayo and Jaamame.
It is a mobile telephone number for the UK.
91 is the dialling code for India. So you would add plus 91 (normally not plus plus 91) to dial a mobile with an Indian number. The phone need not be in India.
No, there is no common ratio for the given number.
That's a number in Zimbabwe. Specifically a mobile number.
Thailand uses the country code +66, and you must also drop the trunk prefix 0 from the beginning of the Thai domestic telephone number. Using a mobile phone, just dial the number in international format, beginning with the plus symbol. If your mobile does not allow you to enter the plus symbol in a telephone number, or if you are calling from a landline, substitute the UK's international access prefix 00 for the plus symbol.
00 1 plus the area code and subscriber number
That's a UK number - assigned to a mobile (cell) phone
Replace the trunk prefix 0 of the Thai number (mobile or landline) with telephone country code +66, including the plus symbol.
+44 770 is the beginning of a UK mobile phone number in international format. In domestic format, the same number would begin with 0770.(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.)
+34 (including the plus symbol) followed by the 9-digit Spanish number
00 34 plus the full Spanish number.