Etiquette in Tokyo, Japan

today, i took a train to the Asakusa Temple in Tokyo, Japan. As I was walking in the gate, i stopped to look at the giant hanging paper lantern. It was magnificent! As i was walking around all the shop's I came across this cute looking one with all these delicious looking snacks! So I bought one and as I opened it, I got a phone call from my sister. So without thinking, I picked up her call and continued walking. After a while my mouth got dry so i took a bite of the snack I bought, and when i looked up, everyone was staring at me! Then I remembered reading something on the internet about eating while walking and answering a phone call in public is really rude! Once i noticed what a big mistake I had made and stopped my sister mid-sentence and hung up. I was so embarrassed I headed for the exit apologizing to everyone who was looking at me.