本人开了个小店，做联通移动冲值办号业务，最近这附近来了几个外国人，来小店买了几张卡，但他们使用过程中出现了很多问题，来找我们，相互比划了一个多小时，无果，晕！！！现急求几句我需要向他们解释的英语，望高手指点，可能的话留个QQ号，感激不尽。
1.你的SIM卡上的话费已经不多了（或欠费了），需要冲值了。
2你的SIM卡上必须要有话费，才能使用17910卡。如果SIM卡上欠费，你的17910卡就不能使用了。
3.建议你的SIM卡尽量少上或不上网，上网的费用可能收费比较贵。
4.我明天帮你咨询一下联通（移动）公司，看看你的话费都用到那里去了。
5.17910卡拨打国际长途每分钟1.2到1.5元不等，看你国际长途的远近，但这种卡打国际长途最便宜。
6.号码拨完后按#号键，不要按拨打键。按错的话要从你的SIM卡上扣费。
7.你现在这个时间用7000卡会很难打通，可能要拨到三四次，因为这个时段用这个系统的人比较多，很忙。不要着急，慢慢打，会打通的.你的朋友也用这种卡，都能打通。
先想到几个，向大家请教，解燃眉之急，再次感谢了！

我把句子写出来，你应该会读吧~

1.The money in your SIM card isn't enough. You need to recharge it.

2. If your telephone charge is overdue,you will be forbidden to use 17910 Card.

3.Give you a suggestion that don't often use SIM Card to surf on the internet because it's expensive.

4.I will help you to consult China Mobile Company tomorrow to find how you spent the money.

5.It will take you one point two yuan to one point five yuan per minute to dial International long-distance calls by using 17910 Card.It all depends on the distance. I recommend 17910　Card because it's the cheapest way.

6.After you dial the number,press the # key please don't press the dialing button,otherwise the money in your SIM Card will be deducted.

7.Ｄuring this period it's difficult to get through.The system is busy now .Maybe need to try 3 or 4 times.
Don't be anxious and take it easy.Your friends also use 7000 Card .It will be OK later.

要ＱＱ号码的话来个人中心留言吧~~，我发消息给你


补充回答你的回答：1.When you dial International long-distance calls ,0.2 yuan basic expense in your SIM Card will be deducted.
2.You have already recharged you bill and your card will be available soon later.If you find the card can't be used tomorrow, just call me.

3.You have 15 yuan Arrearage.The balance of your charges are 31 yuan.Your cell phone has been down.

希望对你有帮助