Please see the following example: MKRGSM/GsmWebClient.ino at master · arduino-libraries/MKRGSM · GitHub - you might also be interested in the other examples listed on Github which are also bundled with the MKRGSM library.
Please see the following example: MKRGSM/GsmWebClient.ino at master · arduino-libraries/MKRGSM · GitHub - you might also be interested in the other examples listed on Github which are also bundled with the MKRGSM library.