According to ICON official website, ICON on ERC20 will be swapped to ICON MainNet soon. Click to learn more details: https://medium.com/helloiconworld/icx-token-swap-schedule-announcement-10238888a50d
To protect users’ ICON assets, CoinTiger will suspend ICX deposit and withdrawal at 15:00 on June 23th, 2018(UTC+8). As the process involved is complex in nature, we suggest that users deposit their ICX tokens on CoinTiger exchange in advance, so we could swap your ICX assets to ICX MainNet after ICX MainNet implements.
*ICX that deposit into original ICX address from June 23th, 2018(UTC+8) will lost and can not be recovered.
*After ICX MainNet implementation, CoinTiger exchange will create new ICX wallet address. ICX that deposits into original ICXaddress will lost and can not be recovered.