Depending on the load requirement, I have used NowSMS (nowsms.com) for some of my projects. NowSMS is pretty straight forward to use. For others, I wrote my own gateway using Smslib - that can be a pain though, depending on the phone you want to you.
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Depending on the load requirement, I have used NowSMS (nowsms.com) for some of my projects. NowSMS is pretty straight forward to use. For others, I wrote my own gateway using Smslib - that can be a pain though, depending on the phone you want to you.