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Yes, I've tried EVNotify. It does work. But EVNotify only works on newer phones or tablets.
You do need a second phone left in the car.
So I had the choice of leaving my new phone in the car and carrying around an old one. Or waiting a year or two until I get my next phone, and then I can leave the old one in the car.
I have a Konnwei KW902 OBD reader.

 

Thanks for the tip. I may give this a try with my old S6 Edge if I can find a free SIM with data

 

It seems that the OBD2 port loses power after a period of time in my Ioniq Electric.
I get readings from evnotify via Telegram for a while, but after a (yet undetermined) period, the Telegram bot only returns last known state of charge.

 

Thanks emjayes I will wait and see how this develops

 

does anyone know if this drains battery when the car is switched off? Is it safe to keep the dongle in the car overnight with the car off, no battery drain if the dongle is plugged in ?

 

I leave my OBD II dongle plugged in without problems. But some on the forum have reported battery drain. I think it depends on the dongle. I bought a better, more expensive, well know brand name one that features an ultra low energy draw in "sleep" mode. Some other dongles don't have that.

 

ok thanks! I think i will keep the dongle out then, don't want to chance it.

 

I have it and got it to only notify me once. I contacted the app maker and he said there is a new more reliable app being written. I would even pay for it if it worked. 28 kWh cars need this and Hyundai refuses to give any firmware updates to limit charging. Brutal lack of responses from Hyundai