Nearly 47 percent of subscribers, who opted to switch operators after mobile number portability (MNP) was introduced, belong to Grameenphone (GP).
With a subscriber-base of a little over 70 million as of August this year, GP, owned by Norway-based Telenor, is the largest operator in Bangladesh.
MNP was rolled out on Oct 1, which the telecoms regulator said will also ensure a level-playing field for all the operators.
In the first five days (Oct 1 and 5), a total 10,122 mobile phone users filed for switching operators, according to report released by the Bangladesh Telecommunication Regulatory Commission (BTRC) on Tuesday.
Of them, 4,181 users switched operators while 5,862 were declined to reasons, including technical issues.
A total of 4,616 GP subscribers applied for switching operators in the first five days, accounting for 45.6 percent of the total applicants.
Robi, the second largest operator which has a subscriber base of 46.13 million (August 2018), received 5,891 applications while 709 subscribers of state-owned Teletalk wanted to switch operators.