Provider Singapore and South east asia

edited December 2013 in - Singapore
Dear All, I'm new in here.
I'm sorry if this title already discuss with someone else. I need some advice from singaporean.
what is the best phone provider in Singapore? If I want to go to traveling around south east asia start from singapore, should I change sim card? I mean is there any phone provider that I could use around south east, so I don't need to change my phone number when I'm traveling.
Thanks in advance.

@fentyasnath

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