It is a public switched telephone network operator in Bangladesh.
[1] Onetel has obtained license from Bangladesh Telecommunication Regulatory Commission to provide fixed phone services in the northwestern part (Rajshahi Division) of Bangladesh.
where 880 is the International Subscriber Dialling Code for Bangladesh and is needed only in case of dialing from elsewhere.
Omitting +880 requires using 0 instead to represent local call, hence 064 is the general access code.
Onetel has established three customer service centres in Rajshahi, Bogra and Rangpur.