I currently havehave the ellipsis Jetpack and im wanting to purchase thethe 8800l from another site. Will I be able to just switch the sim card and power it on and be ready to go?
If the SIM's are the same size then you are good to go. If not then you will need to purchase and activate a SIM of the correct size.
See page 9 of the Elipsis User Guide:
See page 10 of the 8800L User Guide: