No, 00 is not an ISD code, full stop. It is a commonly used international access prefix, dialed before a telephone country code. For example, +591 is the country code for Bolivia, so, from many parts of the world, you would dial 00 591 to call Bolivia.
Also, with the exception of special codes for satellite telephones and other transnational services, there are no telephone country codes (ISD codes) specifically for mobile phones. Otherwise, mobile phones use the exact same country codes as landline phones.
(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.)
The country code for bulgaria is +(00)359
+44 is the country code for the United Kingdom +44 77 is a mobile phone.
Replace the 0 at the beginning of the UK telephone number (landline or mobile) with 00 44. For example, 07700 900123 becomes 00 44 7700 900123.
The physical location of a mobile phone is not relevant to how you dial it. To call a US-based mobile phone from the UK, dial 00 1 and the area code and number.
00 isn't part of the country code, it is a commonly used international access prefix. Country code +91 is India, and +91 9269 is a mobile phone in Rajasthan.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +972 is Israel, and +972 54 is an Orange mobile.
You can get restriction code for your Nokia 2330c mobile phone from Theunlockspot.com at reasonable price.Here they ask you to spcify the country name,current network provider and IMEI number of your mobile phone.After specifying these details,they deliver an unlock code through email.Then you can unlock it using code by following the instructions given for your mobile phone from that site itself.
To call any German telephone number (mobile or otherwise) from the UK, replace the trunk prefix 0 of the German domestic number with +49 (calling from a mobile) or 00 49 (otherwise).
00 1 from a landline or +1 from a GSM mobile phone, followed by the area code and number.
'00' isn't part of the country code, it is a commonly used international access prefix. Country code +886 is Taiwan(Republic of China), and +886 9 is a mobile number.
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On a mobile phone, +1. On a landline phone, 00 1.