Start with the programmes, then the package
Make a short list of the networks and programmes that drive the decision. Compare that list with Sling's current package details. A package name or a sports image is not a substitute for checking the actual lineup in the relevant market.
The next question is simultaneous use. Two people watching different programmes on a weekend may need a different arrangement from one person changing channels on a single screen. This is why a plan comparison should include the household's busiest viewing period, rather than only its monthly price.
A combined package still has channel-specific limits
Sling's current help page distinguishes Orange, Blue and combined-package streaming rules. It describes a combined allowance with a restricted group of Orange channels that can be viewed on only one active device at a time. Other allowed screens do not turn those channels into unrestricted duplicates.
That distinction matters when one screen works and a second screen receives a limit message. If both screens are trying to use a channel in the restricted group, the result may be an expected account rule. Resetting the router or buying a different streaming box would not change that rule.
Count the actual viewing sessions
Sling also explains that on-demand viewing, DVR playback and use of eligible channel websites or apps can count towards the available streams. Include those sessions when investigating a limit message. A tablet left playing a recording can matter even when nobody is watching the main television.
To test a household setup, record the package, each active device and the exact channels or versions being played. That small matrix is more useful than writing only that the account allows several devices. Device registration, having an app installed and an actively playing stream are separate conditions. Review the provider's current rules before changing a package specifically to solve a concurrency problem.
Questions about this guide
Does a combined Sling package mean every channel can play on four devices?
No. Sling documents channel-specific limits within combined packages. Compare the channel being watched with the current package rules.
Can DVR or on-demand playback use a stream allowance?
Yes. Sling's help page says those playback sessions count, as can viewing through eligible network apps or websites.