Will I loose all data on my cell

Are you saying that you started an iOS update manually and it failed to complete properly? ... or that it completed and you can get access to the phone, but it is not able to make or receive cellular calls? Regardless, what have you tried, so far yourself, to resolve this so that we don't try offering you potential solutions that may not have already worked for you?

If it is a cellular update failure, the following article should prove helpful:

• If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart - Apple Support

Depends on what you are trying to do with your iPhone. If you are asking will you lose any data on your phone if you restore it, then the answer is yes and you would have to restore it from a backup.