validateSms 
  Validates a given MSISDN and sender.
Return
true if the MSISDN and sender are valid, otherwise false.
Parameters
msisdn
The MSISDN to validate.
sender
The identifier given to the sender of the SMS message.
Validates a given MSISDN and sender.
true if the MSISDN and sender are valid, otherwise false.
The MSISDN to validate.
The identifier given to the sender of the SMS message.