dial-out via modem over dsl ? Possible?

To cut expenses I dropped my phone line and use my cell for business calls.

The first problem I ran into is I needed ro test a modem on a PC I repaired for a fee.

I have three choices,

connect the modem to the dsl line for dial out and testing.

connect the cell phone to the modem for dial out and testing.

Suffer the $40.00 a month to have a phone line that I rarely use, no incoming calls, no faxes,
etc.

Any suggestions?

Thanks in advance,