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You can use an old Sony Ericsson phone as free or dirt cheap GSM “shield” for sending and receiving messages (turning on/off some device), sending collected data (as e-mail, SMS, MMS) to any location, receiving or initiating calls – for example if an alarm is triggered, or to listen what is going on in remote location - but also by using ordinary AT commands it is possible to set and read phone’s timer, clock, calendar, use basically any phone’s available function. This is where it gets even more fascinating…

...

This is the list of the Sony Ericsson phones which have Rx-Tx connection, which are very easy to connect with Arduino:

2218z,
A2618s, A2618sc, A2628s, A2628sc,
F500, F500i,
J200c, J200i, J300a, J300c, J300i,
K300a, K300c, K300i, K500c, K500i, K506c, K508i, K600, K608i, K700, K700c, K700i,
P800, P802, P900, P908, P910a, P910c, P910i,
R300d, R300LX, R300z, R310s, R310sc, R320s, R320sc, R380e, R380sc, R380s, R380WORLD, R520LX, R520m, R520mc,
S700c, S700i, S710a,
T200, T202, T20e, T20ec, T20s, T20sc, T238, T28s, T28sc, T28z, T28WORLD, T290a, T290c, T290i, T292a, T29s, T29sc, T300, T306, T310, T312, T316, T39m, T39mc, T60c, T60d, T608, T60LX, T610, T61c, T61d, T616, T618, T61LX, T61z, T628, T62u, T630, T637, T65, T68, T68i, T68ie,
V600i, V800,
Z1010, Z500a, Z502a, Z600, Z608, Z800i.
...

EDIT: PDU var ju ett J*vla format !!

The file pduconv.c (version 0.1) contains the following two callable functions:

int ascii_to_pdu(char *ascii, unsigned char **pdu);
int pdu_to_ascii(unsigned char *pdu, int pdulength, char **ascii);

AT
OK
AT+CMGF=1
OK
AT+CSMP?
+CSMP: 17,255,0,0

OK
AT+CMGS="070278xxxx"
> Hello World!
+CMGS: 42

OK

RING

RING

RING

RING

RING

RING

RING

NO CARRIER
ATD033xxxxxxx;
OK
ATH
OK