Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Is your smartphone an Android OS smartphone? if so, there is Epson iPrint for Android that should work.
If your smartphone is an Apple iPhone, then Epson iPrint for iOS should work with it.
And if neither works, perhaps Epson Email print might serve better.
Let me know which of the three you have tried, whether you have an Android or an Apple smartphone, and I will advise you further as needed.
Somehow your question stated that you had an Epson printer. If it is an HP C310 instead, then try the HP ePrint app: