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Older house? Newer houses are likely to have more jacks; jacks weren't even common in older houses as they tended to be 4-prong or hardwired.
– InterLinked
Commented Jan 21, 2020 at 18:09
@InterLinked My mom's house was built in 1952 — 70 years ago — and had phone jacks in the living room, dining room, and two bedrooms. Granted, they were 4-prong jacks rather than modern RJ11 jacks, but converting them to RJ11 only takes a few minutes.
– AndyB
Commented Jan 22, 2020 at 3:44
Right, I should've specified "modular". I think 4-prong jacks would have been most common at that time, or hardwired. Portable phones weren't common until the late 50s, and modular not until the 70s, so modular jacks are more common in homes from the last 30-40 years
– InterLinked
Commented Jan 22, 2020 at 15:19

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