Not sure if this affecs Public Mobile users in Ottawa,
I got this from my office cellphone:
"Planned cellular outage. TELUS is planning an upgrade on their mobility network to ensure continued service quality for greater capacity and reliability. This maintenance will cause a voice and data (HSPA 3G) interruption on Wednesday, May 4 between 00:01 ET and 06:00 ET"
Just as an fyi for other people from Ottawa
JL.