I'm generally satisfied with Wind since I'm paying about half compared to the other guys. The big problem though is that their phones do not work in the basement, or elevators. That would include shopping malls, parking garages or stores that are below ground. It's a pain, but I live with it since the cost is still less than half. I don't mind a bit of peace and quiet while I'm in the basement. Obviously, not everyone feels that way.
I don't have any problems with Wind most places in the GTA including central Mississauga / Oakville all the way to Markham / Richmond Hill. I travel to these areas regularly so I this is my experience. I went as far as Ancaster and didn't have any problems. There seems to be a dead zone on the 401 near the Islington Avenue area in Etobicoke for some reason.
Since I cannot take calls in the basement I rely on two apps: Skype and MightyText. You can call any phone line using Skype (though you have to pay for that) from your PC. MightyText allows you to see and reply to your text messages sent to your phone from any computer. This means you can leave your phone upstairs and when a call comes in, the MightyText app sends you a notification on your PC in the basement. Not the most elegant solution and Skype adds a bit of cost, but it is still cheaper than the other options. This is the only solution right now until Wind or Mobilcity decide to either improve their network or make signal boosters that work in the basement.
You can connect a smartphone to any device that supports wi-fi. It's sometimes called "tethering" or "hot spot." Technically, tethering is connecting a cable between your phone and your PC. Tethering is typically supported only on laptop or desktop PC's. You can't usually connect a smartphone with a cable to an iPad, another smartphone, or another tablet. I could be wrong on this though. Hot spot is sharing the wireless on your smartphone with any other wireless device. This means you do not need to bring your phone's cable with you. The downside is that it's a drain on the battery.
Either method is still quite slow on Wind or Mobilicity and is only practical for checking e-mail and looking at Facebook. Playing games, uploading photos or videos even watching YouTube can be problematic. I don't know what the experience is with the big 3 phone companies.
Wind and Mobilicity are so much cheaper than everyone else because I think their strategy is to get as many subscribers as possible yet sell the service at a loss to attract a bigger player to buy them up. Almost happened with Telus and Verizon was rumoured to be thinking about buying them. It's well documented that both companies are losing big money so I wouldn't be surprised if that was their actual strategy.
IMO Wind has a stronger offering since they now have a wider selection of phones compared to Mobilicity. For example, you do have the HTC One, Samsung Galaxy S3 and S4, the Note II and the Blackberry Z10 and Q10. Mobilicity's best smartphone right now is the Galaxy S4.
You won't find all of the latest phones including the iPhone 5 on Wind or Mobilicity. An unlocked iPhone 5 would work with Wind though. Unlocking means that you can use it on any carrier and means you have to buy the phone outright. That could set you back $600 - $700 dollars. You can get phones unlocked just about anywhere including some smaller malls like Cloverdale in Etobicoke.