[ simple
] Ç÷£À» ¹Ù²Ù´Â°Ç ¾Æ¹«¶§³ª °¡´ÉÇÕ´Ï´Ù. À̹ø´Þ¿¡ ÃÊ°ú µÉ°Í °°À¸¸é ±×´ÞÀÌ ³¡³ª±âÀü¿¡ upgradeÇÏ¼Å¾ß ÇÕ´Ï´Ù. Ç÷£ ¹Ù²Û´Ù°í ³¯Â¥°¡ ¹Ù²îÁø ¾Ê½À´Ï´Ù. Àü¿£ ´Ù½Ã ³¯Â¥°¡ plan upgrade³¯Â¥ºÎÅÍ ´Ù½Ã ½ÃÀÛÀÌ µÆ¾úÁö¸¸ Áö±ÝÀº ¾Æ´Õ´Ï´Ù. for example, if your plan cycle ends by 4/1/10 you can upgrade before 4/1/10 and you will be covered by 1400min and you don't have to pay $150 extra. But if you change your plan after 4/1/10, then you are liable for the charges
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