Starting to talk with other carriers.
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Something I have heard is that the older MTS wireless agreement with Rogers included older "3G/EDGE" wireless service. When the agreement was redone with Bell that older service was no longer included as Rogers is planning to soon decommission that service to free wireless spectrum for newer services like improved LTE/VoLTE coverage. As that service is going away it didn't make sense to include in the newer agreement.
Typically people depending on those older services to have any wireless service are on the edge of the service area to begin with.
I think that this is going to be more common among all the providers as they go to self service format to reduce staff costs.
Stories of bad service exist for most large companies if you go looking for them. For example, it wasn't long ago that Telus was known to offer the cheapest wireless service in Winnipeg but you could expect to completely lose service as you drove past the Perimeter HWY leaving Winnipeg.
Shaw stands out as memorable for me in giving away digital set top boxes when a bunch of new channels were introduced. As I was under contract at the time including a box rental for $3/month I wasn't too concerned as I new boxes would change quickly at that point in the market. Thing is within about a week of ended the promo Shaw decided to no longer honour the previous rental rate that was part of a contract with Videon (before the takeover) and the new monthly rate was almost tripled!
Those are just two stories from the telecom space but you can find stories along those same lines for any company.