I received an "OK" response in the chrome browser but the SMS was not received on my cellular phone when using the URL:
I tried all possible combinations with leading 00 with + with or without country code, With %2B etc.
I do receive the SMS when using the Group command:
So that eliminates all Modem issues or GSM connectivity problems. (by the way in the group I used any kind of combination of my phone number, like my phone with no country code or with country code, all works great.
Unfortunately, I can't use groups because I need a simple device to send SMS and I can not manipulate this device's commands into groups.
I Have RUTX12 with Firmware RUTX_R_00.07.01.4
Hope to have your help ASAP need to implement the system