If the unit has been working and suddenly stops or you have followed the steps above and everything appears to be OK but you still do not have a connection to the internet, then the fault is likely to be with the SIM or network operator. Could any of the following factors be applicable?

• The SIM is a Pay as You Go type and the credit has expired?
• The SIM is a normal mobile phone SIM and not a Data Only SIM which some network operators insist must be used in wireless router type systems?
• The SIM is a monthly contract SIM but has a data limit that you have exceeded?
• You are using the SIM in another country but the network operator has not enabled roaming?
• The SIM is not properly registered?

The only option in this situation is to contact the network operator, which can be a convoluted exercise, but we have seen this situation many times and if you can get through to the right person and tell them the exact nature of the problem, then it can be resolved.