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Phones without SIM cards (CDMA Phones) will no longer work on the Telus network, as that technology has been replaced by the HSPA technology. CDMA was due to cease in 2015 by Telus, and by Bell in northern locations by 2017.
You can dig around the internet for more info on this change.
You can likely find a newer used phone at a good price to replace the aging Samsung, if you don't want to buy a replacement outright.
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