Like the functionality of address books, distribution lists and statistic / tracking tools. Struggle with the logging in process (have to log in with username and password to get through to portal login page and have to login a second time to get access) so have generally been put off using Mobivate and not persued moving from my previous (current) provided of sms services. Also, majority of my marketing is within UK for which I currently pay £0.02 per text compared with £0.03 offered by Mobivate, 50% higher charge per text can mount up on large volume marketing.