A guys that I known did something similar: he bought lot of SMS unlimited SIMs, a bunch of cheaper chinese Android phones and he create an SMS gateway with this solution. After a while the telco start banning the phones from the network because they see an huge number of SMSs coming from the same mobile cell. Then he decide to spread the phones to friends and family, but after a while they got banned too. So he made an agreement with a friend that have a courier company and in every truck they put 20/30 phones sending SMSes all the time. Never got banned and he grow up the company until he sold it for 5 milion
A guys that I known did something similar: he bought lot of SMS unlimited SIMs, a bunch of cheaper chinese Android phones and he create an SMS gateway with this solution. After a while the telco start banning the phones from the network because they see an huge number of SMSs coming from the same mobile cell. Then he decide to spread the phones to friends and family, but after a while they got banned too. So he made an agreement with a friend that have a courier company and in every truck they put 20/30 phones sending SMSes all the time. Never got banned and he grow up the company until he sold it for 5 milion