Dear Jeff, I am writing to inform you that I have decided to resign from my position as [Job Title] at XYZ Telecom. My last day of work will be [Date]. I would like to express my deep gratitude for the opportunities and experiences provided by XYZ Telecom during my tenure here. I have greatly valued the support and guidance of my colleagues and superiors, and have grown both professionally and personally as a result of my time with the company. However, after careful consideration, I have decided to pursue other career opportunities. I assure you that I will do everything in my power to ensure a smooth transition and I will be happy to train my replacement and finish my current projects before my departure. Please let me know if there are any other steps I need to take before my last day of work. Thank you again for the opportunities and support provided during my time at XYZ Telecom. Sincerely, [Your Name]