For those of you who might consider using VOIP.ms as suggested recently by MB (Michael Bazzell), beware of the limitations, specifically the MMS limitation.

Without MMS, you will NOT be able to receive messages over 160 characters in length. This is caused by the SMS 160 character limit. Anything >160 characters gets converted to a MMS message.

List of limitations below:

⚠️ LIMITATIONS

➜ The limit of the capacity to send SMS/MMS via the portal is unlimited. 
➜ The limit of sending SMS/MMS via the API is limited to 100 per day. For any modification to the limit, please contact support or open a ticket via the customer portal. 
➜ At the moment, receiving and reading MMS is only possible through the message center or by using the SMS/MMS Forward option. MMS through SIP protocol is not available. 

➜ The SMS/MMS Service is only available for US and Canadian local DID Numbers marked with the distinctive SMS/MMS Icon. 
➜ The SMS/MMS Service can only be used to send SMS/MMS Messages to Canadian and US 10 digit numbers at this time. 
➜ SIP SMS messages will only be delivered to and accepted from SIP trunks using username/password authentication. 
➜ SIP SMS messages use the SIP MESSAGE method. See RFC 3428 for details. 
➜ At this time we cannot guarantee that Short Code SMS Messages, which are usually 6 digits or less (e.g.: Skype, Bank Codes, TV Commercials etc...) will work. 
➜ We cannot guarantee that accents or special characters including non-Latin letters will be properly delivered. 

➜ Public URL shorteners such as bit.ly, tinyurl.com etc, are widely restricted by mobile providers as a response from the industry to combat SPAM campaigns and protect the consumer. Including this type of links into your messages may result in a blocked or undelivered message. 
➜ For Ported In Numbers compatible with the feature: The SMS/MMS Functionality will be available up to 48 hours after the porting process is marked as Completed. 

➜ VoIP.ms reserves the right, at its sole discretion, to limit or disable the SMS/MMS service from any account that may present marketing patterns/automation patterns/bulk sending or receiving. 

___