Text messaging (or "SMS") is very effective: studies have shown a 97% open rate for text messages (it's also very "personal": never send an unsolicited message). Text messaging is broadly used: according to a recent report, 68.8% of mobile users use text messaging in the US.
Yes, you can use MailUp strictly as a direct marketing platform for sending out text messages. Features include message delivery date/time stamp, detailed delivery errors (if any), statistics, and more.
No, if you use MailUp without the ability to send email messages, but rather just for SMS (text messages) campaigns, you will not be charged a monthly fee. You will only need to buy the credits you need to send your messages.
Sure, you can add the ability to run email campaigns at any time. Price is based on the bandwidth that you wish to subscribe to and some additional options (see email campaign management pricing). Contact your MailUp account manager for more information.
No, MailUp is a true multi-channel direct marketing system: contacts are managed across all channels. If you have both email and mobile phone number for your contacts, you can import both into MailUp and contact the same customers through different channels.