cheapest pay as you go phone

Can I use an iPhone 3G on a seniors plan?
My grandson got a iPhone 4 and gave me the iPhone 3.
Thank you for taking the time to answer.
D-L

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The new CityFido plan has unlimited calling in any CityFido area (here on right-hand side choose your province and it'll show your CityFido zone) but unlimited incoming are available only in your CityFido zone. It's also includes unlimited text messaging (sent/receive).with price $35 per month.
If your home area isn't in CityFido zone you can choose one of prepaid plans.
- By the Minute plan (without fixed monthly price), rates: 30¢ per minute and text message is 20¢.
- $19 Plan prepaid plan which includes: 50 daytime minutes, 300 evenings & weekends and 50 text messages
- Talk & Text for 10¢ (monthly fee is $10) which includes: pay-per-use minutes & messages only for 10¢.

Fido has few basic phones with low price:
1. Nokia C1 (Price without contract $50)
2. Nokia 2720 (Price without contract $70)

I am senior ,please let me know , what is the best plan for me?
Is NEW!CITY FIDO PLAN with unlimited calling/out/in best plan for me ?
Can I get phone with the large no.s and what is my cost ?

Try to compare Fido plans on this page. You can select up to 10 plans with acceptable prices and see, what they include.