Yeah, such thing is exist. Such as ZTE V9 Android Tablet, and Huawei S7 Android Tablet. All of them design look like big smartphone, theny all have a 7 inches touch screen, have the call function, You can find all these two gadgets from modem3g.com:
ZTE V9 Highlights:
• Supports voice calls in UMTS 2100 MHZ/900 MHZ dual band
• Internet access through HSUPA networks, with a data download speed of 7.2 Mbps and up to 5.76 Mbps upload speed.
• A complete range of features including GPS, e-mail, SMS, video and music player, and FM radio
• Features Bluetooth and WiFi functions
• Run for up to 250 hours in on-hold mode and 240 minutes in conversation mode
• It allows storage on Micro SD cards of up to 32GB and will run for 10 hours without a recharge
• Gravity Sensor Support

Huawei IDEOS S7(Smakit) Highlights:
Popular mobile communication services
• Support WCDMA/HSPA GSM/GPRS/EDGE
• Support voice communication, SMS, MMS, Email and mass mailing
• 2 million pixels camera
Abundant Android™ applications
• Android™ Open OS for customized services
• Rich Android™ applications download
Enjoyable HD media playing and multi-tasking
• Support multi-tasking
• Support 720p media playback
Easy and portable Internet surfing experience
• 7" touch screen gives you full-screen web browsing experience
• Support WiFi 802.11b/g/n
• 15.5mm ultra slim, weighs only 500g, easy to carry about

Hope this helps!