gt 2005 - what phone fits? have anyone a ori phone? is it nokia 6210 kind of? if yes what exactly model should work?

 

The original phone won't work with today's cellular carriers. The original phone was 2G and maybe 3G compatible which are pretty much useless today. I don't know if the '05 has bluetooth but that's how I used my phone with my '09 and now '16 GT.

 

it is not true, 2g/3g is still in service, just put your sim card in old phone... you just can not use the 4g/lte speeds etc, you run on lower performance connection.

 

I don't know where you are but most US carriers are in the process of or have phased out 2G/3G service. See: https://bit.ly/3H6wpAE
Outside the US I don't know but would expect the same is true or soon to be true. In fact my alarm company recently sent me a new 4G/5G communicator to replace the the 3G version since 3G will soon be gone. It makes little sense to support 2G/3G equipment and dedicate valuable frequency spectrum to a service that very few people need. If a cell customer can't afford a new phone it's cheaper for the carrier to just give them a new 4G/5G phone to keep their business.

 

europe...
if you get into non-lte area, automatically our cell phones switches to 3g or even lower.... this is standard telco regulations...