América Móvil’s Ecuadorean mobile subsidiary Porta Cellular says it will compensate its pre-pay customers for billing mistakes that have been occurring since March 2000. In a statement last Friday Porta confirmed that until 30 September 2005, pre-paid customers will receive USD10 and USD30 in bonuses when buying pre-paid cards with a face value of USD20 and USD30 respectively. Porta Celular was accused of having overcharged some 1.8 million users between 2000 and May this year. It apparently charged them for calls from the moment they hit the ‘send’ button until the call ended, adding an extra ten to 20 seconds on the average time of each call. Last week the country’s telecoms regulator Suptel ordered Porta to compensate its pre-paid customers for the error, although it did not specify the actual amount of the reimbursement expected.