A1 Carrier From
Bulgaria

The A1 Carrier From Bulgaria is denoted by codes: 284 01. The followings IDs are called HNI (Home network identity). This code is created by the combination of two other Mobile Country Code (MCC) and Mobile Network Code (MNC). The first three numbers stand for the MCC and they are used in order to identify the region which the carried comes from (in the following example it’s Bulgaria). The last numbers of the HNI code are equal with the MNC and this ID is given for the specific mobile network operator.

Besides A1 Bulgaria has assigned country code + 359. This number + 359 is equal with international calling code and it’s simply the telephone dialing prefixes used for calling A1 numbers.
A1 uses 2 GSM bands, 2 UMTS bands, 2 and 0 CDMA bands.. You can read the specific frequency bands in the table below. All bands of the A1 are display in MHz units.
Another important information in A1 Bulgaria architectures is the standard of used protocols. It also uses 9 protocols such as GSM, UMTS, LTE, CDMA. The ISO standard code of A1 is BG. You can see more info about this mobile network operator at http://www.a1.bg/. How to check A1 coverage? How to check if your phone will work in Bulgaria?