Please call me (at + 电话号码) if there's anything urgent.
For urgent things, pls call me. 其实这句很好说,基本上意思可以,比较随意。 比如 Call me if anything urgent; Call me for anything urgent. 等等。。。
you can call me if something happens
Please call me if there is something serious.
call me if needed.
Something urgent please call my mobile phone.