[mrb]

I deposit checks through Schwab's Android app. But this only works for checks under $10k. Above that you have to deposit them at a Schwab location.

[1stranger]

You can also mail checks in (though I don't know about $10k and above).

[whyenot]

You can mail checks much larger than $10k in. That is what I usually do, as it’s less of a hassle than getting to a branch during business hours. Schwab even provides post paid enevelopes for you to use.