If your company is spread across multiple countries or cities, you should look for a company that can provide services in all of these locations. It is not uncommon for popular IT companies in Las Vegas at https://www.nsa-nv.com/it-companies-in-las-vegas/ to offer different levels of service depending on the budget and customer needs. This can be:
Payment support: In this case, you will be asked to pay hourly or a certain amount. In general, this agreement is more expensive.
Troubleshooting Support: These can be invoiced hourly and paid for in advance or later after the job is complete. This can be paid regularly, for example at the end of a quarter or half a year or once a year.
Managed Service Support: The maintenance company aggressively controls your system to minimize the chance of failure. This is usually the same as signing an annual maintenance contract.
Support includes spare parts: This type of support means that the company offers replacement/repair of hardware components for free. This is an expensive proposition for support companies and very few people can offer this type of support.
If you're having trouble, you want to make sure the company will provide support within a certain timeframe, which they have to guarantee. It depends on the amount of support you are willing to pay. Additionally, it sometimes takes longer than expected for companies to identify and correct true faults.
The company understands your business strategy and takes steps to ensure it meets your IT needs. Not many are expected to work with one or two contacts all the time.