Papers probably was the wrong one to bold.
Effects (i.e. personal effects) is likely better and the first definition I found is "Items of personal property that one carries on one's person, including identification, jewelry, and clothing.".
I'd argue a phone falls under this definition.
Interesting fact I learned when replacing detectors is that small humans (i.e. toddlers) are more likely to wake up and respond to human voices/words.
There are detectors, for example, that say "Fire" (in English-speaking countries, of course). And kids are statistically more likely to wake up and respond to the smoke detector alert than the brain-piercing, ear-splitting buzzers that are more standard.
I put the above ones in bedrooms and the horrible, deafening ones in hallways and common areas. I also went the 10yr lithium battery route. Had to search online to order these, because they're not generally available at retail stores.