Although most areas in Jersey City are generally safe during the day, exercise caution when walking alone at night. Streets are virtually deserted after midnight, making those walking alone easy targets. If possible, walk in large groups, or take a taxi. If you must walk alone, stick to well-lit, major streets and don't flash your wallet, cellphone or iPod.
Try to avoid the southern section of the city, bordering Bayonne, particularly the neighborhood of Greenville. In particular, Martin Luther King Drive and Ocean Avenue should be avoided. Muggings are not entirely uncommon in this primarily low-income area, and drug and gang violence are rampant. Hang around after dark at the light rail stations AT YOUR OWN RISK there have been series of robberies and muggings recently on the LRHB lines near Danforth/Garfield/LSP.
Property crimes are becoming increasingly common across all of Jersey City. Do not leave any valuables in your car.
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Jersey City is served by two area codes - 201 and the overlay area code, 551. This means that 10-digit dialing is required. When dialing locally within the 201 and 551 area codes, do not dial +1 before the number. For calls to other area codes, you must dial +1 before the number you're calling. Even though New York City is just across the Hudson, it's considered to be a long-distance call. Of course, with the advent of cellphones, long-distance calling is quickly becoming a thing of the past.
As in Manhattan, internet cafes are fairly uncommon in Jersey City as Wi-Fi is becoming more readily available. Notably, Janam Indian Tea on Grove Street and the Daily Grind Coffee Lounge on Morris Street offer free Wi-Fi connections.