Providers of travel eSIMs — digital SIM cards that allow users to connect to mobile networks abroad — are now numerous, but they do not all rely on the same operators in the same country. This means that data speeds and signal strength can vary significantly between different eSIMs, even in the same location. One eSIM might capture a strong signal, while another could fall into a dead zone. To help travelers make informed choices, nPerf has launched its mobile coverage barometer, available in more than 60 countries. This tool allows users to identify the best mobile networks in their destination before selecting an eSIM provider. For the start of the academic year, BNP Paribas is offering a student welcome package that includes a Visa card, free payments abroad, a loan at 0.99%, and up to 175 euros in benefits, including 80 euros in discounts and one year of free membership at Esprit Libre. In addition to this, nPerf has recently published its mobile coverage barometer in more than 60 destinations across Europe, Africa, and South America. These reports are available online on the comparator's website, and new barometers are added daily to expand the database. Each report provides detailed information on 4G and 5G coverage at the country level and then breaks it down by region, helping users choose the best eSIM for their travel needs. For example, in Switzerland, Swisscom has the best overall 5G coverage at 81.75%, according to nPerf, compared to 75.19% for Sunrise and 72.83% for Salt. However, in the large Zurich region, Swisscom ranks last in the nPerf barometer. This means that an eSIM compatible with Swisscom might not be the best choice for someone traveling to that specific area, and an eSIM compatible with Sunrise or Salt would be more effective. A similar situation exists in France, where Orange ranks last in the national 5G coverage ranking but is first in six of thirteen regions, including Île-de-France and Hauts-de-France. To determine which network an eSIM relies on, users should check the list of supported networks in the provider's application. Some eSIMs support multiple operators in the same country, allowing users to manually select the best network in their smartphone settings or let the phone choose automatically. It is also important to note that coverage alone does not guarantee performance. While SFR leads in geographical coverage in France, Free covers the population best, and Orange, despite being last in coverage rankings, is recognized by Arcep as having the best mobile network and the most 5G 3.5 GHz sites across the country. For travelers seeking both coverage and performance, nPerf's mobile performance barometers can provide additional insights.