Q1. are you a manufacturer? Yes, we are China manufacturer of GPS tracker for Q2. What is your sample policy? We can provide samples, but customers have to pay sample fee and courier fee, sorry for this Q3. What is your delivery time? The exact delivery time depends on the item and quantity you order. Q4. Can you provide GPS tracking system and APP? Yes, we have our GPS tracking software/system and APP. we also provide the protocol for integration into your system. Q5: Do I need a SIM card for GPS tracker? 1. Depends on the model. Most of our GPS tracking devices require a SIM card, please talk to our product manager in detail before ordering. 2. Generally 4G devices are compatible with 3G and 2G networks, so 4G SIM card is required. 2G/3G SIM card cannot be used in 4G devices. nb-IOT devices need NB-IOT network, please confirm with your carrier whether there is stable NB-IOT network coverage in your area. 3. We can also customize the solution. If needed, please feel free to contact us. Q6: What is the shipping method? It can be shipped by sea, air or express (EMS, UPS, DHL, TNT, FEDEX, etc.). Please confirm with us before placing your order. Q7: What about quality control and warranty? All products undergo strict quality inspection before packaging.