As Keith says, you need to give more information, but generally if you are here on a 24 month visa post marriage in Philippines, or further leave to remain post marriage in UK, you have to contact your local Department for Social security, they will then give you a phone number to call, they will then give you an appointment, and you will be expected to bring certain documents with you, such as passport, details of job, and then you will be taken through the NI procedures, NI numbers are only issued to those who have job offers in the UK, due to the large numbers of eastern european immigrants looking for NI numbers, the process can take up to 6 weeks.
