The cause of a , starting Sunday afternoon, remained unclear Monday as carriers said only some customers continued to have problems.

B次元官网网址淭eams are working hard to fully resolve the issue and we sincerely apologize to our customers,B次元官网网址� a Rogers statement said Monday.

Telus, Bell Canada and Freedom also experienced problems with voice service about the same time but restoration began late Sunday.

None of the carriers had publicly stated a root cause of the disruption as of Monday afternoon.

The degraded quality of service included dropped wireless voice calls and an unspecified number of customers being unable to place or receive wireless voice calls.

B次元官网网址淪ome customers may still experience intermittent wireless voice service,B次元官网网址� Freedom said in an email Monday afternoon. B次元官网网址漌e sincerely apologize to any of our customers who were impacted by this issue.B次元官网网址�

A Telus email statement said its customers began reporting an inability to receive or place voice calls with Freedom Mobile or Rogers customers starting about 2 p.m. Sunday but those problems were resolved about 1 a.m. Monday.

Bell Canada said its customers began experiencing problems Sunday afternoon as a result of problems with other carriers, which werenB次元官网网址檛 identified, but the service issues were resolved around 10 p.m. Sunday.

B次元官网网址淲e understand that customers at all Canadian wireless companies (including Bell, Virgin and Lucky Mobile) would have encountered problems calling or receiving calls from customers at the affected carriers,B次元官网网址� Bell said in an email.

Besides their flagship brands, Telus offers the Koodo and Public Mobile services and Rogers offers Fido and Chatr.

David Paddon, The Canadian Press

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