1-my users register to my site with cb connect. but i need enable them by default. when they register with google account , they are not approved and not enable in cb by default.
You want them to be auto-approved when registering from Google using CB Connect? Within CB Connect > Parameters > Google > Registration you can control whether they bypass approval/confirmation or not.
2- how can i get his phone number from google to my custom cb field?
Same location as above. If it's available to be mapped you can select what CB field you want it mapped to. Field mapping is no guarantee. A users provider profile permissions can block CB Connect from accessing it.