If your MiFi is appearing for some devices but not others then chances are that the MiFi is broadcasting in a mode which is not compatible with those devices. You can make a quick config change and see if it helps.
3. Sign into the MiFi in the upper right hand corner
4. Click on the WiFi tab
5. Switch the 802.11 Mode from G+B+N to G+B
6. Click Apply
7. Test your connection on the other devices
Please note that you will need to find a computer which can connect to the MiFi before you can complete these instructions. If you do not have one available then ask a friend and borrow thiers for a few minutes. Otherwise you could stop by the Verizon store so they can perform the steps for you.