Whenever you migrate to a different number, it is highly recommended that you utilize both an exit message on the previous number as well as sending a new welcome message on the new number. This helps prevent any confusion for your subscribers and avoids high unsubscribe rates. It's also recommended to setup a branded short domain.
Sending a EXIT and WELCOME message
Example of EXIT messages:
{company name}: We're getting a new number! Look out for our next text from {new number}, and if you have questions email us at {support email}. Reply STOP to opt-out.
{company name}: We're retiring this number and moving onto a brand new number: {new number} Watch out for a text coming from it shortly. Reply STOP to opt-out.
Example of WELCOME messages:
{company name}: Hi from our new number! If you have any questions, email us at {support email}. Up to {X} messages per month. Reply STOP to opt-out.
{company name}: This is our new number! Stay tuned for upcoming exclusive offers. Up to {X} messages per month. Reply STOP to opt-out
Setup a branded short domain
We also recommend if you have not yet, getting your own branded short domain setup. Especially for 10DLC and toll-free users as using common link shorteners including Mobiniti default/shared short domains like mobn.it may cause deliverability issues with the carriers.