You cannot transfer an H1B before you start working. Your new employer will have to petition for an H1B for you. If the first employer is not cap-exempt, you've already been counted against the cap so that won't be an issue.
You cannot transfer an H1B before you start working. Your new employer will have to petition for an H1B for you. If the first employer is not cap-exempt, you've already been counted against the cap so that won't be an issue.