I lost my iPhone 5C. It appears to be dead or offline on Find My iPhone. I have tried to get it to notify me when found and to play a sound, but it stills says those actions are pending. Is there anything else I can do to find this phone? It contains important photos that I don't want to lose.
Unfortunately no, all of the methods for locating lost/stolen iOS devices depend on the device being on and connected to the Internet in some way. If it is not on and/or not connected to the Internet in some way then you are just as likely to find the Boy Scout knife you lost when you were 8 the same way.
Note I am not being facetious here, just trying to be clear.
If someone finds the phone and decides to charge it up, it may reconnect to a network somewhere and become findable again. I would log on once a day and see if that has happened. That chance of that happening? Well your guess is as good as mine.