I also wanted to return the laptop after talked to Dell's Technical support. They asked more then $100 to fix it or buy one year support for $250. Hopefully I got help from my son-in-low who is experienced licensed network engineer and we spent an hour or more on phone to fix the problem and find the correct Wi-Fi setup. Here is the solution that works for my 2015  Inspiron 13 7000 2-in-1. 1. Go to Setting from Start button. 2.  On Setting window go to "Network & Internet" 3. On "Network & Internet" window open "Network and Sharing Center" 4. On Network and Sharing Center window find Connections: Wi-Fi (your wi-fi name) 5. Click on Wi-Fi and open Wi-Fi Status window. 6. On Wi-Fi Status window click Properties button and open Wi-Fi Properties window. 7. You will see the list of items for this connection. 8. Pay attention on two items: Internet Protocol Version 4 (TCP/IPv4) and  Internet Protocol Version 6 (TCP/IPv6). On my laptop both protocols were checked. 9. Uncheck TCP/IPv6. click OK and close other windows. 10. Restart the laptop. After that my problem was fixed and I got Internet. Hope it will help for some of you. 
I just purchased this new laptop today with Windows 10 system. Everything worked fine in first couple hours but SUDDENLY THERE IS NO WIFI CONNECTION. There was just a red cross in on that wifi symbol at low right corner and when I click it neither airplane nor wifi mode is on. I clicked wifi bottom but it didnt turn on, kept grey. I opened setting, turned on wifi but there is no wifi displayed. I go to airplane mode setting screen and in there "wifi" botton was not on. I clicked it try to turn it on but it wont let me. the bottom moved to "on" and then bounced back to be off, Just kept gray... I turned on airplane mode and then turned it off and tried several times to turn on WIFI. it just wont let me. And then I restarted the laptop. THEN THE WIFI WORKED PERFECTLY..... the wifi bottom, after restarted, just worked so smoothly i could turn it on and off with just one click. obviously different from before. HOWEVER AFTER 2 HOURS THE EXACT SAME THING HAPPENED AGAIN... I RESTARTED, WORKED AGAIN.... i think there is obviously some problem. No way that I am gonna keep restarting my laptop every 2 hours....  anyone has any idea?  Thank you!
Dell Inspiron 13-7352 Wifi Dropped Cannot Connect!