Bangladesh is country code +880.
When calling from outside Bangladesh, you must drop the trunk prefix '0' from the Bangladeshi number. For example, Dhaka's area code 02 becomes +880 2. Although this has the same effect as prefixing the domestic number with '+88', it is incorrect to say that Bangladesh is country code +88.
Mobile numbers begin with +880 1. VoIP numbers begin with +880 96.
(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 and area code of Chakaria, Bangladesh is 880, (0)3422.
The country code and area code of Chandpur, Bangladesh is 880, (0)841.
The country code and area code of Balagonj, Bangladesh is 880, (0)8222.
The country code and area code of Maulavibazar, Bangladesh is 880, (0)861.
The country code and area code of Kaliakoir, Bangladesh is 880, (0)6822.
The country code and area code of Nalcity, Bangladesh is 880, (0)4953.
The country code and area code of Bandar, Bangladesh is 880, (0)6724.
The country code and area code of Tongipara, Bangladesh is 880, (0)6655.
The country code and area code of Dagonbhuya, Bangladesh is 880, (0)3323.
The country code and area code of Shathiya, Bangladesh is 880, (0)7327.
The country code and area code of Shibchar, Bangladesh is 880, (0)6624.
The country code and area code of Palashbari, Bangladesh is 880, (0)5424.