Because you didn't set up the specific SOS number and open the caller display of you SIM card.
Firstly, to use your phone call the number of SIM card to make sure the device is power on and the ...
Maybe there are 3 reasons i.e. device power-off, weak or none signal, SIM card debts or GPRS service...
We will arrange the production after receiving your deposit, usually 30%.
After we get contact details, and confirm the samples, you can send us the PO and confirm the order,...
Whatever product you interested, welcome send your information directly to my email, or chat with us...