I have never used Tether outside of exchanges and I wanted to send a small amount to my mobile wallet (Coinomi) and I am wondering how that works?
Coinomi support many tether addresses, it support Omini layer USDt that has the addresses similar to bitcoin address because it is built on bitcoin blockchain, it also support ERC-20 USDt that is built on ethereum blockchain. USDT is also bulit on other blockchains like tron, and it is similar to the address of coin that is built on its blockchain.
- Are the transactions taking place on bitcoin blockchain?
You can check this tether blockchain explorer
https://usdt.tokenview.com/- Do I need to also have bitcoin in that address to pay the tx fees?
Tether fee will be charged not bitcoin fee.
I don't want to move Tether between chains, I want to send Omni layer Tether to Omni layer tether.
Before sending the tether to coinomi, check the prefix of the address on your exchange account, if it starts with 1 prefix, then you will send it to the Omini layer. If it starts with 0x prefix, then send it to ERC-20, also check if it starts from tron address, if so, then send it to TRC20.