... Your wireless network service is best effort. This is why your service provider doesn't have to compensate you for dropped calls or dropped packets or towers with insufficient capacity.
The word "promise" is not an accurate reading of the legal concepts at play in bandwidth purchase. Dedicated bandwidth for consumers is expensive and completely unavailable on cellular networks.
Verizon also doesn't have to let iPhones connect to their network and only does so because they benefit financially from the relationship. Trust me, putting a device onto a major cellular network in the US is highly political, full of peril and financial alchemy.
Source: I do lots of telecom stuff specifically around wireless.
