Not sure how you're using SMS but I found I while back that SMS messages can be "emailed". Maybe it will help you.
#
# Common email addresses for texting.
#
# AT&T: [email protected] (SMS), [email protected] (MMS)
# Boost Mobile: [email protected] (SMS), [email protected] (MMS)
# C-Spire: [email protected]
# Consumer Cellular: [email protected]
# Cricket: [email protected] (SMS), [email protected] (MMS)
# Google Fi (Project Fi): [email protected] (SMS & MMS)
# H2O Wireless: [email protected] (SMS), [email protected] (MMS)
# Metro by T-Mobile: [email protected] (SMS & MMS)
# Mint Mobile: [email protected] (SMS)
# Page Plus: [email protected] (SMS), [email protected] (MMS)
# Red Pocket: Red Pocket uses AT&T or T-Mobile (for GSM SIMs) & Verizon for CDMA. See info. for those carriers.
# Republic Wireless: [email protected] (SMS)
# Simple Mobile: [email protected] (SMS)
# Sprint: [email protected] (SMS), [email protected] (MMS)
# T-Mobile: [email protected] (SMS & MMS)
# Ting: [email protected] (SMS for CDMA), [email protected] (SMS for GSM)
# Tracfone: [email protected] (MMS)
# Ultra Mobile: [email protected]
# U.S. Cellular: [email protected] (SMS), [email protected] (MMS)
# U.S. Mobile: [email protected] (SMS), [email protected] (MMS)
# Verizon: [email protected] (SMS), [email protected] (MMS)
# Virgin Mobile: [email protected] (SMS), [email protected] (MMS)
# Visible: [email protected] (SMS), [email protected] (MMS)
# Xfinity Mobile: [email protected] (SMS), [email protected] (MMS)