0ld wall recepter has four holes for phone line to plug into. can I buy a phone to match?

Any land line phone with a standard line plug or attached line should work just fine.

what side does the phone line plug in and what side to plug the fax line or does it matter two different numbers

The only one mattering is the one to the phone line. The others are your choice.

I have one wall jack, with two lines. Can I use this to have two phones plugged in, and have both phones receive both lines?

no only one phone line can use the jack not two different lines

will this work to run my wireless printer and my computer?

It works wonderfully with my home phone and printer/fax. Thus far I have not had any complaints.

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📞 Double your line, double your productivity!

PLUG PLAY SIMPLICITY - Instantly connects to any standard modular jack—no tech hassle
DOUBLE YOUR CONNECTIVITY - Seamlessly split one phone line into two without extra wiring
VERSATILE DEVICE SUPPORT - Perfect for phones, fax machines, modems, and caller ID units
COMPACT DISCREET DESIGN - Sleek white finish blends effortlessly into any office or home setup
RELIABLE SIGNAL INTEGRITY - 4-conductor design ensures clear, uninterrupted communication

The Uvital RJ11 Duplex Wall Jack Adapter converts a single modular phone jack into two, supporting simultaneous connections for phones, fax machines, modems, and caller ID devices. Featuring a 4-conductor design and universal compatibility, this compact white adapter is ideal for professional and home office environments seeking efficient, clutter-free connectivity.