Recently my daughters mother and I split apart.she is 6 yrs old and I have been in her life the whole time.the problem is her mother doesn't want her and has given permission to the grandmother to watch her.I talk on the phone with my daughter but am not allowed to visit with her.what can I do to get full custody?

Go to court and file for it. Is the child in the same state as when you broke up ?

If so you file in that state. If the mother fled and it has been less then 6 months you can file in the state where the child lived for the last 6 months.

Define "permission"? If you are the child's legal father then the mother can't just give permission. A court has to approve the guardianship of the child.

If you are the legal father you can, theoretically, go and pick up the child and there isn't a lot the grandparents can do about it. But it would probably be best if you go to court and get an order of custody.