Yes, technicians usually call before they arrive.
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Do I have to pay more for mobile service?
Is it necessary for me to stay with the technician throughout the mobile repair or replacement process?
When the technician arrives, you will need to give him access to the keys of your vehicle. After that, you are free to do something else and don’t have to be there while the glass is being repaired or replaced.
After the technician will have finished doing the work, you will be given relevant and important information along with your keys.