Sending out text messages is a great way to stay in touch with business associates or to run an advertising campaign. However, manually entering phone numbers and sending the messages one at a time can take an eternity. That is where a bulk SMS service provider can help. These companies allow you to send text messages to multiple contacts at once, making it fast and easy to get your messages out. Here are just a few of the things that you should look for if you are considering using one of these services: 1. It should be easy to upload the phone numbers.