Recheck ALL details YOURSELF before making your decision.

Fido
www.fido.ca
use any unlocked GSM phone (ATTWS phones are locked, sorry, won't work)
cards: C$15 (100 minutes) & C$30 (200 minutes)
LD @ C$0.10/minute to Canads & US, plus normal airtime charge
e-mail, SMS, data service, voice mail included
Buy a vTech phone for C$125 w/ 333 min prepaid & bonus 333 min 90d later
http://www.fido.ca/portal/product/handsetdetail.jsp?id=vtech_a700&lang=en&cat=1

Bell Mobility
www.bellmobility.ca
CDMA, must use their phones.
Phones C$149 & up, airtime in C$10, C$25 & $C50 cards, C$0.30/min plus LD.
e-mail, data service, SMS, voice mail at extra charge

Telus - CDMA/iDEN
http://www.telusmobility.ca/on/payandtalk/index.shtml
CDMA, must use their phones.
C$10 (25 min), C$25 (75 min) or C$50 (172 min)
Phones $220 & up, activation $50
Also supports iDEN (NEXTEL) on their MIKE network, min charge $40.

Rogers ATT (GSM)
http://www.shoprogers.com/store/wireless/services/payasyougo/overview.asp
buy C$140 phone with 20 min free local airtime. Local airtime C$0.33/min,
Can LD plus C$0.58LD, US LD plus C$1/min.
voicemail, SMS included

Rogers ATT (AMPS/TDMA)
http://www.cellularunlimited.net/prepaid.html
use any unlocked TDMA or analog phone (ATTWS phones are locked, sorry)
C$50 activation plus C$25 for 75 minutes.

CELFON RENTAL ONLY
http://www.cell-express.com/default.html
C$35/wk to rent GSM phone, plus cost of prepaid SIM card (can buy from
FIDO)
This appears to be the least expensive option if you do not already have a
GSM world celfon and wish to use the phone only a little.

YMMV

--
Nobody but a fool goes into a federal counterrorism operation without duct tape - Richard Preston, THE COBRA EVENT.