I am using an arduino UNO and the GSM/GPRS shield (with the sim900). I bought a sim card specificaly for my project (which will be a data logger responding to http requests). I tried the code on the arduino website under 'examples' called 'pin management', and it gave me the message 'PIN & PUK locked. Use PIN2/PUK2 in a mobile phone.' What do I do???
Why not just remove the pin from the sim card using an ordinary phone.Then you don't need to bother with the pin