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 lines, double your productivity!

NO HASSLE SETUP - Plug and play design means zero downtime—just connect and go.
OFFICE HOME READY - Perfect for multitasking environments demanding dependable phone line expansion.
DOUBLE YOUR CONNECTIVITY - Seamlessly split one RJ11 jack into two for simultaneous device use.
CRYSTAL CLEAR CALLS EVERY TIME - 4-conductor duplex design guarantees reliable voice clarity without interference.
UNIVERSAL DEVICE COMPATIBILITY - Effortlessly supports phones, fax machines, answering machines, and caller ID units.

The Uvital RJ11 Duplex Wall Jack Adapter is a dual-port splitter that converts a single RJ11 phone jack into two outputs, enabling simultaneous connection of two devices. Featuring a 4-conductor duplex design, it ensures stable and clear voice communication. Compatible with standard phones, fax machines, and caller ID devices, this plug-and-play adapter is ideal for both office and home use. Note: Not compatible with VOIP or internet data transmission.

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