I initially struggled to understand your English but somehow got it. If you are using a data card (internet card) then it might be slower comparing than the wireless router and DSL modem's speed.
If you can afford and have multiple computers, please go ahead and get a broadband internet connection and get a latest wireless router. A wireless router does not cost too much nowadays. I can suggest some of them to you below:
(1) D-link DIR 615
(2) Securifi's Almond (This is world's first touch screen wireless router)
(3) Linksys E1200 wireless N router etc............
Feel free to let us know, if you need any more information about your internet connection or routers.............