Desktop format on a cell phone

It appears Opencart provides cell phone formatting whenever it senses a cell phone browser. I had a request for a way for a customer to use the desktop format on his cell phone. Is it possible?

Well, you seem to be a Service Provider, kind of, because you're talking about a Customer Request.
Therefore, I advise you, to better make yourselfs smart, by reading the many existing Forum Postings on such,
or then, get professional assistance.
Nothing personal, just plain information !
Ernie