If it's a new WeChat, I've heard that you have to have an existing WeChat member vouch for you. If it's an existing account, there is a process to unlock - something like start the process, message (say sms) someone you've Wechatted with, and have them use a code... been a long time since I've had to do that (old phone dead so couldn't do a simple xfer). But there are instructions on WeChat.