Train operator SMRT had first announced at 6:43am that Circle Line trains might experience delays due to signal interference and that Circle Line trains were manned on Friday morning. It then tweeted at 7:04am that commuters along the Circle Line will experience temporary suspension of mobile services.

Telco companies Singtel and M1 also announced earlier on Friday morning that their mobile services on the Circle Line would be temporarily suspended until 9:00am. The two companies later updated the time of resumption to 9:30am. M1 later said at 9:32am, "On instructions from the authorities, the mobile service suspension along the Circle Line will be extended until further notice."

Some commuters complained about the lack of mobile service and considered avoiding travelling on the Circle Line. The suspension comes after an earlier halt was carried out on the Circle Line on Thursday night for more than an hour until about 10:30pm. The suspension was also to facilitate tests for the source of a signal interference which disrupted train service on Wednesday.

A mysterious signal interference had resurfaced on Wednesday morning, interrupting train service on the Circle Line for three hours during peak hour. Service ground to a halt for more than an hour at five stations between Botanic Gardens and Serangoon. The signal interference first occurred in late August, disrupting service on the Circle Line for a week. This was traced to an unknown signal interference, but it disappeared before the source could be traced by SMRT.