Problem is solved! WWAN card was missing from laptop. I actually did so many things to install the WWAN driver, but guess what was the problem here? My computer has place for SIM CARD but the WWAN was missing from the E6400. So my advise to others are FIRST check if your computer comes with WWAN card By looking at device manager or removing backside  so you would know if that is installed or not or It might show up in Device manager and you can find proper driver for it.

Re: My Latitude D620 has a SIM CARD SLOT below Battery. Principialjnaya elektricheskaya shema zaryadnogo ustrojstva kulon 715d. Only if you also purchase a WWAN card compatible with your cell service provider - along with a data plan for Internet access. By itself, the SIM card is not sufficient for connectivity.

Embarcadero rad studio xe 2011 v 150389034076 with crack. You can also try to find the correct model by little programme called unknowndevicedetector. Hope this help some one Mehraban. SIM CARD on Latitude E5570 Referring to the aforementioned subject, kindly be informed that we search for a driver or software that solve the detection of the SIM CARD which already have slot as a part of in my laptop Latitude E5570. We found that another device (WWAN) should be installed in the laptop to let the SIM CARD working properly. Unfortunately, DELL make a very smart laptop with high performance and with nonworking features. There is something need to review and check by the technical team in this regards. Best Regards, Mohamed Hegazy.