Okay I love AppSumo products. Bought this simply because I love SendFOX and was curious. Did not mind Tier 1 SMS access and upgraded to Tier 2 for MMS capability and 5 lines. I too was wondering so I asked. Extra lines and MMS will cost a monthly charge provided by another AppSumo Service from what I was told.

I have not used ShortySMS yet and it is more of a standby product. Also do not mind the low entry fee. Looked like Tier 1 is the only one you can get "Free" and I am not sure of that either, but will find out if I ever decide to use.

Not a big fan of SMS advertising or notifications on phones but purchased this more as an insurance policy for viruses are rampant on the net and even in emails. With that said we may be turning toward SMS and MMS with people actually paying attention in the future. Who knows.

Check it out you form your own opinion. Yes strange that I'd buy and not use, but with it being this price you can afford to do that and save it for the rainy days.

Hope this helps. Don't forget there also is a generous refund period :)