The X30 is available in the high, mid and low models; only the low model did not come with wireless (Bluetooth and wifi). To check if your device has wifi, tap on Start - Settings - Connections and look for the Dell WLAN Utility. If it's there, then yes you have wifi. If it turns out you do not have wifi, then you can purchase an SD wifi card such as this one (the P300):
Socket Mobile Go Wi-Fi! 802.11b/g Cards
Read more about routers and setting up a home network in Ike's very helpful guides:
http://wifi.aximsite.com/