Back in the very early days (1930s) for Nancy Drew, there were less-advanced sleuthing gadgets for a detective to use. Sure, Nancy drove her own car and had running water and electricity in her home, but calling someone on the phone looked different back then.
A good detective skill to remember: we can't always rely on our phones. If the battery dies or if it gets damaged while on a case, it's best to have important phone numbers memorized or written down and stored on your person. You never know when you'll get in a jam and need to borrow another phone! I personally carry a miniature phone book in my bag, just in case.
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