Reddit reviews iPhone Headphone Adapter (2 Pack), -579 (Renewed)
We found 2 Reddit comments about iPhone Headphone Adapter (2 Pack), -579 (Renewed). Here are the top ones, ranked by their Reddit score.
Works with Google VoiceEasy to Set-Up Using OBiTALK.com. USB for Obihai Accessories OBiWiFi5G and OBiBTAlso Supports T.38 Fax and SIP Bring Your Own Device Services like Anveo, Callcentric, Voip.ms, etc.Works with Up to Four (4) VoIP Services Across One (1) Phone PortCall back service present. Application for iphone, ipad, ipod touch and android devices which makes possible placing and receiving calls to/from other OBi endpoints
Leaving my original reply below for reference, but I think you're best served by CircuitSwitched's reply. I didn't realize just how bad your DSL setup was. There's also some further conversation that might be of interest here.
ORIGINAL REPLY:
As mentioned by another, port to Google Voice. But instead of using the web interface they suggested, get an Obihai 200 - you connect it to your internet router and to your house's landline phone jack & all the phones on the landline become VoIP using GV. Service will be free and you can treat the phone just like you always did, dialing numbers directly.
EDIT: I should mention that this assumes you've dropped landline service. You should test the setup by plugging a phone directly into the Obihai before you drop landline service itself. You can port the landline number after you've verified it's working (just let Google assign a random number to the account for testing - you can port after the fact). In fact don't drop the landline directly - porting the number out should automatically end landline service, and you don't want to drop service until the port is done.
You also needn't worry about the bandwidth - I've successfully made GV calls even when throttled to 64Kbps on Sprint, so 0.5Mbps is plenty. The time it might be an issue is if you've got some other internet activity sucking up bandwidth (streaming video, etc), but your router may have options to prioritize certain traffic if that's a concern.
Google voice VOIP adapter, like this...
https://www.amazon.com/OBi200-Adapter-Support-Service-Renewed/dp/B07SF8LYG6/ref=mp_s_a_1_8?keywords=google+voice+sip+adapter&qid=1565405974&s=gateway&sr=8-8
Or OOMA service...
Or BT tethered to cell phone
I have one of these
https://www.amazon.com/gp/aw/d/B00135XU7Q?psc=1&ref=ppx_pop_mob_b_asin_title