AWS Device Farm now lets you add unmetered Android and iOS device slots to your account to escape unlimited tests for a recurring monthly fee of $250 per device slot. Pricing for unmetered testing is fixed regardless of test type and device minutes used. Regardless of the number of device slots that you purchase, you can test on any number of devices and execution concurrency is simply limited to the number of slots. To learn more approximately device slots please visit our FAQ.
Source: amazon.com