...w200i i got from my aunt? anyone please post the unlock instructions for it for free!

IMEI:35426901-272758-5-13
Network: GLOBE
Made in China

Purpose: I want to switch to SUN network for the unlimited text because it is cheaper.

Note: My gosh, the cost to have it unlocked is more than what a second hand w200i phone costs on the market

Thank you very much!