spelled out SMS

Author: Justinha

articles/active-directory/authentication/concept-authentication-phone-options.md

@@ -44,7 +44,7 @@ Microsoft doesn't guarantee consistent SMS or voice-based Azure AD Multi-Factor
 
 ### Text message verification
 
-With text message verification during SSPR or Azure AD Multi-Factor Authentication, an SMS is sent to the mobile phone number containing a verification code. To complete the sign-in process, the verification code provided is entered into the sign-in interface. 
+With text message verification during SSPR or Azure AD Multi-Factor Authentication, a Short Message Service (SMS) text is sent to the mobile phone number containing a verification code. To complete the sign-in process, the verification code provided is entered into the sign-in interface. 
 
 On Android devices, MFA text messages may be sent over Rich Communication Services (RCS) rather than SMS. RCS offers encryption and other improvements over SMS. Android users can enable RCS on their device.