SIM Technology's (HKG:2000) revenue from its core business fell 11% to HK$19.7 million in April from HK$22.2 million a year prior, according to a Friday Hong Kong bourse filing.

The decrease came amid changes by the firm's customers in the delivery time of their purchase orders.

The mobile communications company recorded total revenue of HK$22.7 million in the month, down 12% from HK$25.8 million in March.

For the four months ended April 30, revenue slipped 18% to HK$116 million from HK$140.6 million in the year-ago period.