My situation here,

My offer letter do mention that 3 months of probation period and resign during probation will need 1 month notice. and after confirmation then i will need to serve 3 months notice.

Problem now I'm in my 4th month and I'm not given any formal or verbal notice that I'm a confirm staff. So I should be serving 1 month notice right?

3 months notice period is an advantage? hahaha

i need to serve 3 months notice after being confirm. not sure but i think is a disadvantage if you resign without a job offer