You can reset the phone if it is an android. Moreover there is an option of forget password. It can reset your password if you want to.
You cannot unlock a phone using Gmail. Gmail is only connected if you login the lock application using it. It can help if you forgot your code.
You can go to your local phone store, and they have ways of unlocking it.
You can install Gmail on a galaxy phone. Gmail can be installed via a Gmail app. This app can easily configure mail in that.
If you forget your gmail login you can click on forgot login or password information link.
You can get a call phone in Gmail if someone calls you. Gmail calling is not free but chargeable. It can be done to anyone in your contacts.
You can send images to Gmail via phone also. You need to have Gmail signed in on phone. Then compose a Email and click on attach.
Click "Forgot Password" on the login screen and follow the security steps.
You can get your password back if you forgot it. Google provides a link for that on Gmail page. You have to follow some steps for it.
Provided that the mobile phone has data access, you can simple go to gmail and access your emails. Depending on your phone model, you may also find a gmail app which makes emailing even easier.
You cannot get SMS alerts on your phone via Gmail. However you can get the mails if you want. You can download Gmail app and sync it with your phone.
You can call from a Gmail account to any home phone. You can do that by calling in Gmail. However it is not free and costs you money.
Yes, there is a Gmail App for windows phone. Gmail app is used to log in from phone. Multiple accounts can be logged in at once.