Mobile phone data cables have two main functionalities, the first application is for data trasmision, connect internet, change logos, ringtones, etc. and second application is to use in service mode, repair phones, change configuration, remove SIM lock (service provider lock), activate hidden menus, etc. Most of this cables connect to Serial port, but we have available USB to serial convertors su you can use in computers that have only USB.

Above you can see Nokia an Siemens compatibility list

Nokia Compatibility List

Our data cables are designed to work with the GSM Nokia phones. The following table summarises the user compatibility reports for Nokia phones

Note 1: DirectIR can only be used in conjunction with 2 player snake mode on some handsets.
Note 2: Design problems in some versions of the 7110 itself mean that correct operation cannot be guaranteed (contact your service centre for an upgrade if you are unsure), however most handsets have no problems.  Infrared may be more reliable than cable on this handset.
Note 3: The 9110 requires a special MBUS service cable.  Phonebook management/SMS not supported.
Note 4: Later versions of certain phones contain an animated startup logo that overrides the custom startup logo.  The animated logo can be removed using special software, available on request.
Note 5: Some operators override the startup logo feature on this phone.  
Note 6: Some SIM cards conflict with certain versions of this phone, affecting operator logos - contact your operator if affected.
Note 7: Phonebook only supported on V4.24 of the 3310 or later.  

Terms used:

Cable - connection via DAU-9 compatible data cable (the DLR-3 can also be used with the 6210 and 7110)
DirectIR - works when bypassing the IrDA drivers and in conjunction with a generic IR port or supported dongle
IrDA - works with the standard Windows IrDA drivers. Windows 95 users may also need to use the separate IR update tool
MBUS - works with MBUS cable (DAU-9 compatible, not DLR-2), with LogoManager configured for MBUS
SMS - works via Phase 2 text messaging where available. A cable or IR port is still required.
WAP - animated screensavers can be uploaded to this handset via the Internet/WAP
www - can be sent to the phone via the Internet (dependent on your provider)

Note: this feature is only available on certain TDMA handsets, and depends on your provider and the availability of a suitable messaging subscription. Depending on your tariff, some providers may make a per-message charge.
The WebSend button enables you to send ringtones and group graphics to TDMA phones via the Internet. The 3260, 5165, 8260 and 7160 support ringtones, and the last two also support group graphics.
To send, first edit your group graphic or ringtone, then connect to the Internet, and then click the WebSend 'world' button in the toolbar. In the dialog that follows, select your service provider and enter your 10 digit phone number. Note that some service providers have several different messaging centers which depending on your tariff or region, so if one messaging center is unable to deliver to your handset, then you can try one of the alternatives.
Note that the list of networks does not necessarily indicate support for that network - this is wholly dependent on your particular service. If your network is not listed, and you would like it to be, or if you are unable to send to a listed network, then just let us know.

Vx.xx - only compatible with specified phone firmware versions and later
Incoming - although not directly compatible, this handset can receive this type of message sent from other phones via SMS

Siemens Compatibility List

Please note:
Sony Ericsson T300 provides Modem Setup program on their website
It would be a lot easier to connect with T300 if the IR connection speed is tuned to be 19200 bps 
*Currently Mobile Action does not provide Handset Manager for P800 but MA-620 USB Infrared Adapter 
  is approved to be compatible with Sony Ericsson software by Sony Ericsson Mobile Communications AB