When contacted, a SingTel spokesman said that while it does use customer data to offer relevant advertising, "we are extremely cautious about not sharing individual customer details with third parties".

"When specific information is required, it is always permission-based," she added. M1 said that it keeps customers' personal information strictly private and confidential, and "we do not share customers' information with other parties".

Customers still worried about their data privacy, despite the safeguards, have some reprieve. StarHub said that its customers cannot opt out of information collection, but they can write in "to withdraw their consent to the use of their information" for SmartHub-related projects

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