Mobile number portability in Bangladesh is off to a relatively slow start, with just 107,343 successful migrations in the first three months of the introduction of the service.
The market's second largest mobile operator Robi Axiata was meanwhile the only operator to gain customers from number porting since its introduction in October, the Daily Star reported.
Robi saw 72,005 customers join the operator, with 20,406 switching to another provider, for total net additions of 51,599, the report states.
Robi's rivals Banglalink, Telenor Bangladesh and state-owned Teletalk all saw more customers port out than port in, with Grameenphone losing the most customers at 39,167.
According to the report, industry insiders state that the initial rush to take advantage of mobile number portability was more muted than expected, with one possible reason for the lower demand being the cost of porting.
Customers were being charged a SIM tax of 115 taka ($1.37) on top of a service charge of 57 taka. But the government recently scrapped the SIM tax, leaving only the service charge to pay.