You can use more than one phone, but only one line is available. Both phones will share the same telephone number.
Linlin, my apologies for not being helpful.
Simple answer is YES, it will provide service to work with two phones.
There will only be one phone number associated with the Straight Talk Wireless Home Phone device, however.
There are two ports on the back of the Straight Talk Wireless Home Phone device that you can plug either one or two of your corded phones into that you use at home.
And as previously mentioned, you can plug the base of a cordless phone system into the back of the Straight Talk Wireless Home Phone device which will allow you to use multiple cordless handsets which you can put in various rooms in your house.
Again, you first have to purchase the "device" that I gave a link to below. This card ONLY supplies service to that device and nothing else.
(Although Straight Talk Wireless Home Phone does not support "backfeeding" through the wiring and jacks that you currently have in your house, many have done so successfully by making sure that the wired phone service coming into your house is completely disconnected and disabled. Using this method, you can conceivably use the existing jacks you currently have in your house which will then allow the use more than two phones.)
If you'd like to ask a more specific question, post it and I'll do my best to try and answer it.
Linlin, this card only supplies service to the Straight Talk Wireless Home phone device. If you haven't already done so, you can see and purchase it here for $69.88 (copy-and-paste):
Yes, there are TWO ports/jacks that you can plug two home phones into the back of the unit. You also can plug a base unit to a cordless phone system into the device and have multiple phones using the Straight Talk Wireless Home Phone that you can put in various rooms in the house.