Huawei has announced that it will no longer pursue new business in Iran, after criticisms that its technology was being used to track dissidents.
In November, the US-based group United Against Nuclear Iran, claimed that Huawei technologies had been used to track the cellphones used by dissidents.
In a statement on the company website, Huawei said: "Due to the increasingly complex situation in Iran, Huawei will voluntarily restrict its business development there by no longer seeking new customers and limiting its business activities with existing customers.
"For communications networks that have been delivered or are under delivery to customers, Huawei will continue to provide necessary services to ensure communications for Iran's citizens."
The company also noted that all its business in Iran "has been in full compliance with all applicable laws and regulations including those of the UN, the United States and the European Union."