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Hi, cofounder of Simple here. We work with partner banks who hold on to deposits. For all intents and purposes, you never have to think about who that partner bank is, but if you ever need to contact them directly, you'll know where your funds are. You might find our FAQ informative: https://www.simple.com/faq/ .
I don't understand who I call when a problem arises. Do I call you, the anonymous partner bank, or is it simply impossible to call somebody if I have an issue?
You call us if you have a problem or question. We'll let you know what bank your funds reside at, but you should never need to contact them. We have our own in-house customer relations staff.