Mobile convergence is an emerging trend in the wireless communication industry. Modern multi-standard mobile phones are required to provide a variety of location independent services like voice, data, video, the Internet and multimedia content without compromising on their weight, volume and performance. Therefore, it is important to develop compact internal multiband antennas for these mobile terminals while maintaining good return loss and radiation performance over the desired frequency bands. Because of the compact and low profile nature, planar inverted-F antennas (PIFAs) are promising structures for these applications. Planar inverted-F antennas also exhibit low SAR values and experience less detuning effects in comparison with external or internal printed monopole antennas -. Conventional PIFA has limited bandwidth of 4 % to 12 % for a -10 dB return loss . However, variants of PIFA structure in combination with other broadbanding techniques can be utilized to realize antennas with multiband performance. Multiband internal antenna design for handset applications is an active research area. A wide variety of PIFA based multiband antennas have been reported in the literature -. Conventional PIFA with a short and a feed strip is used as a basic element to get single or dual band performance. PIFA structure is then modified by using various design procedures to get multiband / wideband performance. Commonly used techniques include the use of slots, multiple quarter-wave strip resonators, and parasitic patches. Slots are created in the main radiating element to excite multiple resonances, quarter-wave length resonators are individually designed and arranged in a compact formation, and parasitic elements are primarily utilized for broad banding purposes. Furthermore, Wireless Local Area Network (WLAN) frequency band around 5.2 GHz is also likely to be included in the future personal communication handsets. Therefore, multiband antennas with seven or more frequency bands are needed for the future mobile phones. In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication Services, 1880-1990 MHz), UMTS (Universal Mobile Telecommunications System, 1.9-2.17 GHz), WiBro (2300-2390 MHz), Bluetooth (2.4-2.48 GHz), S-DMB (Satellite-Digital Multimedia Broadcasting, 2.630 ~ 2.655 GHz) and WLAN (Wireless Local Area Network, 5.16 ~ 5.5 GHz) frequency bands. Multiple frequency bands have been realized by using slots and quarter-wave length resonating strips. A matching stub and multiple short circuiting strips are utilized for improving impedance matching across the targeted frequency bands. A prototype antenna is fabricated and characterized by measuring return loss and radiation patterns. Comparison of the measured and simulated results is given in the paper.