My iPhone rings for 15 seconds – which is actually eight rings – before it goes to voicemail, but even that’s not long enough if I’ve put the phone down in another room or it’s zipped into a pocket in my jacket.
To change your night greeting on a Samsung OfficeServ 100, 500, 7100, 7200 and 7400 phone systems: Press the voicemail button Press * # 0000 Enter the system password Press 1 to edit system prompts Enter 1002 for the Night prompt Press 1 to listen to the current prompt. If this is not the prompt you want to record press * * If this is the correct prompt press 3 to discard the current recording and begin recording a new prompt. Press 2 when finished and review the greeting. If the greeting is acceptable press # to save Hang up

To delete a message, swipe it left. To delete more than one at a time, tap Edit in the top right corner. Then select the messages you'd like to delete, then tap Delete in the bottom right corner.
Open the phone app and navigate to RecentsFind the telemarketer call.Select the information icon on the right, then scroll down and tap Block this Caller.Calls from that number will be blocked in the future.