SMS module

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#1
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Hi, guys!

Which SMS module could you recommend me?

It has to be small, compact, PCB mounted, working on 3,3V or 5V, USART connection.

Something like: http://www.lantronix.com/device-... which I use for IP.

Is there something like "MMS module", this device takes picture and sends it like MMS to cell phone?

Thnx and cheers !

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Is a SIM300 over-kill?

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If can write my idea then use Telit module GL865. this module is more better then SIM. I long time use SIM300DZ,SIM900,SIM100. but Telit is better, SIMCOM module are cheap. But Telit module is more usable. Now I use in my project Telit module. of course my older project use SIM300DZ or SIM900. but now I prefer Telit. In my proto board I use GE865, but I want in final work want use GL865. this module work with piton script if want, work with gprs is very easy. and have FTP, email clent.

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Quote:

SIMCOM module are cheap. But Telit module is more usable.

You only have to learn to use it once - isn't "cheap" more important than giving the programmer an easy ride?

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I long time use SIMCOM gsm module , but problem is so some time freezes and no one can help only switch power off , wait and then power on again. telit too can freezes but work better.
what is different in telit are AT command.
telit have easy and good command what inform user about all status of GSM in one sequence.
and have AT command , what other gsm module don't have.
like SIM card . can check if is inserted or not, if is accessible or busy... .
TCP / IP work good, FTP client work too good.
on first project I use internal I2C pin and python for make small program , to control external I2C LCD, and create small alarm (call or send SMS .. .) and it work , but problem is so minimum time after switch on gsm module and start pythons script is 5 second and this is long.
GL865 is good choise.

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Quote:

but problem is so some time freezes and no one can help only switch power off

My previous company ran a deployed network of about 10,000 units which each used a SIM300 extensively and we never had any such problem so I'd suggest the problem may have been in your design/software.

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5 years ago we used about 500pcs units and all work good, no problem , bat in 2008 problem begin.
I don't know why but module freeze . and problem is solved only with external MOSFET power transistor. switch off power module and then power on again.
now I have project to use Telit.