If you send a few SMS each hour, the SMS Server Tools are the best solution for you to build a very stable SMS Gateway.
But if you send thousands of SMS each day you should ask your phone network provider for a SMSC Large Account. It may be much cheaper for you. On http://www.bai.de you can buy software for Large Accounts.
I collected some pricing information for germany. Sorry folks, but I cannot ask every provider on the world for detailed pricing informations. The following Table is only valid for germany. Prices in EUR:
Date 27.6.2001.
provider | price into own network for each SM | price into other networks for each SM | base price each month | minimum charge | software | notes |
D2 CallYa, GSM Modem | 0.2 | 0.2 | ||||
D2 Fun, GSM Modem | 0.06 | 0.2 | 12.8 | the first 100 SM cost 0.11, the following cost only 0.06 | ||
D2 Large Account Datex-P/ISDN | 0.018 | not possible | 180 | 799 | receive not possible | |
D2 Large Account TCP/IP | 0.024 | not possible | 1026 | 799 | ||
D2 Fun, GSM Modem + Centrium |
0.08 | 0.14 | 12.8 | see www.centrium.de | ||
D1 Xtra Card, GSM Modem | 0.2 | 0.2 | ||||
D1 Telli, GSM Modem | 0.076 | 0.2 | 12.8 | |||
D1 Datex-P/ISDN | 0.018 | not possible | 103 | 799 | receive not possible | |
E-Plus, GSM Modem | 0.076 | 0.2 | 10.2 |
E-Plus does not offer a large account.
Performance note: Sending a message takes about 10 seconds. If you need a faster solution you can use more than one GSM modem or you can use a large account.
You can send messages with one single GSM modem to destination in all phone networks but this may be expensive. If you use one or more modems for each phone network provider you can save a lot of money. If you prefer a large account think about this: In germany each large account sends messages only into its own network. And E-Plus does not offer large accounts.