Concatenated messages can only fit 153 characters instead of 160. For example, a 177 character message is sent as 2 messages. The first is sent with 153 characters and the second with 24 characters. The process of SMS concatenation can happen up to 4 times for most bulk SMS providers, which allows senders a maximum 612 character message per campaign.
SMS messaging follows the rules of permission based marketing. It’s 100 percent opt-in based. Simply put, customers have to give their expressed consent before receiving SMS messages. This can be done in one of three ways. New subscribers can double opt-in¹ via web widget, add their cell number to a compliant sign-up form or text to join. The latter is the most common. After opting in, the new subscriber will receive an auto reply confirming their subscription. If the opt-in was accidental, they can simply reply STOP, and all messaging will cease.
There is a 160 character limit on text messages. With SMS, it’s simply about providing an irresistible offer. There’s no point in droning on and on with a 300-word marketing message. Subscribers are opting in to receive an exclusive offer, not to hear about how your day is going. Our current digital age rewards simple marketing messages with easy to understand calls to action. The 160 character limit on SMS messages is actually ideal.
Grey Routing is a term given to messages that are sent to carriers (often offshore) that have low cost interconnect agreements with other carriers. Instead of sending the messages directly to the intended carrier, some bulk SMS providers send it to an offshore carrier, which will relay the message to the intended carrier. At the cost of consistency and reliability, this roundabout way is cheaper, and these routes can disappear without notice and are slower. Many carriers don’t like this type of routing, and will often block them with filters set up in their SMSCs.