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UndeleteSMS
Recover deleted SMS messages from a GSM SIM card.

gsmlib
This distribution includes a library to access GSM mobile phones through GSM modems. Features include: modification of phonebooks stored in the mobile phone or on the SIM card, reading and writing of SMS messages stored in the mobile phone, sending and reception of SMS messages.

Roaming
Using a wireless phone outside of your service provider's local coverage area or home calling area is referred to as roaming. Roaming arrangements between service providers expand the potential area for phone use. Service providers typically charge a higher per-minute fee for calls placed outside their home calling or coverage area. Roaming within your home network, this means that your mobile phone automatically sets up communication procedures with different radio base stations when on the move. International roaming means that you can use networks other than your own when traveling abroad.

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