Someone told me that when I joined up and got a free phone,its usually is the last years phone and the newer phone is comming out. Thats ok, but they also told me that they start to kater to the new phone's upgrades and signals and you don't get as good a signal as the newer modle phone. For example I joind in 2014, got a Samsung Galaxy S4mini for free, I think,some how I paid $100.00 for something. At that time the Sanmsung S5mini came out. well I find that my signal and service is poor, and have a hard time getting servise in some areas where other people that have the newer phone can get good servise. Is this true? and why?