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Most of the hotels have free Wi-Fi, but inform before booking. Getting online on the streets is harder, but you can try the shopping malls. There's a Starbucks with paid Wi-Fi at The Mall Bangkapi. If you don't want to pay, there's free Wi-Fi at Assumption University in Ramkhamhaeng Soi 16 Hua Mak. If you happen to be far out into the 'burbs, Fashion Island also has free Wi-Fi but you need to register for a username and password; follow the instructions from the manual at their official website (http://www.fashionisland.co.th).