As geno888 stated, it is possible but the results will almost certainly come out fugly. And even if the phone's camcorder can capture full SD resolution of 720x480, the imaging sensors are simply not of high enough quality to produce videos suitable for viewing on a large screen -- the images will almost always come out noisy.
Even transfers from video originals on standard VHS tape to HD can turn out fugly due to standard VHS's low effective horizontal resolution of 240 to 250 TV lines per picture height. (Compare this to analog NTSC broadcast's effective horizontal resolution of 320 to 330 TV lines per picture height, S-VHS/Hi8's 400 to 420 TV lines per picture height and Hollywood-mastered 1.33:1 DVD's approximately 500 TV lines per picture height.) Converted to absolute digital pixels, this corresponds to 320x480, 440x480, 560x480 and 720x480, respectively, for these "standard-definition" video formats. For PAL, 576 lines are used for the vertical resolution.
And when '70s originals get transferred to HD, they do not use the already existing standard-definition broadcast prints (unless such copies are the only ones extant) -- but instead, they go back to the original film source, which is usually of even higher resolution than full HD video. A few '70s shows were shot directly to videotape; therefore, they are ill-suited for direct transfer to HD.