I've just bought a gsm/gprs module named GTM900b and
this module has an option that when you give "A/" to it it'll repeat every command
you sent to it ...and when you want to get rid of it you shall need to reset settings
for resetting the setting you've to use this command : "ATZ0"
I used it for the first time and it worked ...I became able to take "HUAWEI OK" and "GTM900B OK"
but just for one time ....I cannot use it anymore and I've no idea what the problem is :(
can anyone help me with that ?