16GB 3G v3.0.1 software

I just had a question regarding how to properly set up SO voicemail on the Iphone.

I have found these instructions:

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1. First, take note of what your voicemail number is with your current provider (for example, in Spain the Vodafone voicemail number is 177).
2. Click on the phone button in your iPhone.
3. Click on the keypad tab.
4. Tap the following code:

*5005*86*xxx#

The xxx is the voicemail number, in our example it will read: *5005*86*177#

5. Tap call.
6. After a second, the code will have been set.
7. Tap now on the voicemail button and it will automatically call your usual voicemail service.

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However, I do not know what number to put to replace the "xxx#"

If any of you know how to properly set up the voicemail button with Speakout Wireless on a iPhone please don't hesitate to reply.

Thank you in advance.

P.S.

I am located in St. Catharines which is in the Niagara Region. My phone # area code is 289. Hope this helps.