Sí, si vas a una tienda Apple, te venderán el A1633 que funciona en todas las bandas 4G que se están usando actualmente en España. En el peor de los casos, que te vendan el A1688, te va a dar igual porque la banda 30 no se usa en España (de hecho es el A1688 el que se vende en Europa).
iPhone 6s
1. A1633: The iPhone 6S A1633 is the most comprehensive model. It is available on AT&T and some more carriers in the US. Apple also started selling the A1633 as sim-free version on Apple Store and you will have to pay full price for the device. It supports LTE bands 1 (2100 MHz), 2 (1900 MHz), 3 (1800 MHz), 4 (AWS), 5 (850 MHz), 7 (2600 MHz), 8 (900 MHz), 12 (700 a MHz), 13 (700c MHz), 17 (700b MHz), 18 (800 MHz), 19 (800 MHz), 20 (800 DD), 25 (1900 MHz), 26 (800 MHz), 27 (800 SMR), 28 (700 APT MHz), 29 (700 de MHz), 30 (2300 WCS); TD-LTE bands 38 (TD 2600 MHz), 39 (TD 1900 MHz), 40 (TD 2300 MHz), 41 (TD 2500 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz); TD-SCDMA 1900 (F), 2000 (A); CDMA EV-DO Rev. A (800, 1700/2100, 1900, 2100 MHz) and UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz).
2. A1688: The global phone has almost the same bands as the A1633, except that there is no LTE band 30 (2.3 GHz WCS spectrum deployed by AT&T). This model will also work on both GSM and CDMA carriers. The A1688 is sold at T-Mobile (locked and contract-free), Sprint and Verizon in the US, as well as in Europe and Asia, including countries like the U.K., France, Germany, Singapore, Hong Kong, China and Japan. You will also receive this model when you take advantage of Apple's new iPhone Upgrade Program (except that you are an AT&T customer)
3. A1700: This is the model being sold in China, it will work with all carriers here like China Mobile, China Unicom and China Telecom. It has the same specifications as the A1688. Specifically, it supports FDD-LTE (bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 27, 28, 29), TD-LTE (bands 38, 39, 40, 41), TD-SCDMA 1900 (F), 2000 (A), CDMA EV-DO Rev. A (800, 1700/2100, 1900, 2100 MHz), UMTS (WCDMA) / HSPA + / DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz) and GSM / EDGE (850, 900, 1800, 1900 MHz).
iPhone 6S Plus
1. A1634: The iPhone 6S Plus A1634 is the GSM & CDMA phone and it has the same cellular connectivity as the A1633. The phone is available on AT&T as well as some more GSM carriers in the US like Boost, NET10, Cricket, US Cellular or StraightTalk. You can also pay full price for the iPhone 6S Plus as Apple is selling it as sim-free version. Specifically, it supports LTE bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30; TD-LTE bands 38, 39, 40, 41; GSM/EDGE (850, 900, 1800, 1900 MHz); TD-SCDMA 1900 (F), 2000 (A); CDMA EV-DO Rev. A (800, 1700/2100, 1900, 2100 MHz) and UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz).
2. A1687: This is considered the world phone or global phone as it works on both GSM and CDMA carriers, and it is the most popular model being sold around the world. Like the corresponding iPhone 6S version, the A1687 doesn't have the LTE band 30 (a new LTE band used by AT&T). The phone is available on Sprint, T-Mobile (locked and contract-free) and Verizon in the US, many carriers in Europe and Asia, as well as the Apple's iPhone Upgrade Program. Besides, if you pay full price for an unlocked version on Verizon or T-Mobile, you can be confident using it almost anywhere on the planet.
3. A1699: The model is sold in China and compatible with China Mobile, China Unicom and China Telecom. It has the same specs as the A1687.