MoobilenetX's end date is confirmed for June 22nd, 2017. You'll want to use the following wifi signals starting ASAP (and they'll be your only campus choices on June 23rd);
Eduroam: For people with UCD Login IDs. For the login name, use your_campus_loginID@ucdavis.edu (firstname.lastname@example.org for example). Eduroam, using those same credentials, is available at many universities the world over. Check http://eduroam.org. Also, if you have issues connecting, download the CAT tool from http://cat.eduroam.org to have it auto-configured.
UCD-Guest: For visitors -- will ask you to self-register.