Another important aspect that people must remember when they purchase US sim phone cards from HolidayPhone, in the United Kingdom before they travel to the United States of America for their holiday or business trip, is to ensure that the mobile phone that they use in the United States is not locked to a specific mobile phone operator. The prepaid USA sim card service from HolidayPhone is based on the prepaid US sim card owner using a foreign prepaid sim card from another operator. Therefore it is critical that all prepaid USA sim card owners use mobile phones in the United States that are not locked and dependent on only one single mobile phone operator. This is an aspect that people often forget to check before they leave on the trip to the USA.

If owners of US sim phone cards from HolidayPhone do suddenly discover while in the United States that their mobile phones are locked to a single operator what they can do is use an older mobile phone model or unlock the mobile phone that they have with them in the USA. However, the most practical and financially viable option here is to actually buy another cheap temporary mobile phone from Holiday Phone. However, prepaid sim card owners will have to purchase the cheap mobile phone from Holiday Phone while they are in the United Kingdom and before they leave for the United States of America.

Another option that people who are already in the United States will have to choose is to contact another mobile phone supplier in the United States and hopefully they can then solve the ‘locked mobile phone' problem for the prepaid USA sim card owner. The Force Majeure clause also excuses HolidayPhone from any obligations beyond its control. As Wikipedia defines Force Majeure as, quote "These clauses excuse a party from liability if some unforeseen event beyond the control of that party prevents it from performing its obligations under the contract. Typically, force majeure clauses cover natural disasters or other "Acts of God", war, or the failure of third parties--such as suppliers and subcontractors to perform their obligations to the contracting party. It is important to remember that force majeure clauses are intended to excuse a party only if the failure to perform could not be avoided by the exercise of due care by that party" end quote.

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