Gain access is a commonly used phrase that refers to the act of obtaining entry or passage into a restricted area, system, or information. However, there are several synonyms that you can use to add variety and depth to your writing. Some good alternatives for 'gain access' include 'obtain entry,' 'secure entrance,' 'gain admission,' and 'enter into.' Others may include 'attain access', 'acquire entrance', 'gain admittance', 'penetrate' or 'infiltrate'. Each of these alternatives conveys the same idea as 'gain access,' but using a variety of phrases adds interest to your writing. By incorporating different words and phrases into your vocabulary, you can make your writing more engaging and effective.