How to fix service/signal issue on iPhone 4 T-Mobile?

Hey guys I have an iPhone 4 and I have T-Mobile. I can never get service in certain parts of the building where my friends that have AT&T can. Could anyone guide me to a tutorial on how to strengthen my signal? I'm currently running iOS 6 and am jailbroken so if you have an Cydia tweak that helps let me know.

Call t mobile

  • WHAT's WRONG WITH VERIZON FOR IPHONES? Any one else having the issue of it saying no service? Keeps going in and out for no reason SO ANNOYING IT DOES THIS LIKE 20 times a day! IT DID THIS WHEN I HAD A SCHEDULED INTERVIEW OVER THE PHONE AND THEY TRIED CALLING AND LEFT A VOICE MAIL AND I HAD TO RESCHEDULE. WHY IS THIS HAPPENING?! I had this issue last year on my iPhone 5s and it was happening again like a week ago. I put the SIM card into my 6plus and sure enough. SAME THING. I'm GONNA STICK MY FOOT UP VERIZONS *** AND MAKE THEM LICK THE POOP OFF MY TOES!
  • Since iOS 6 update, my Verizon iPhone 4 service keeps dropping and loosing signal? Since I updated my iPhone 4 (Verizon) to iOS 6, my cell signal is constantly dropping or searching. Doing so also kills my battery life. Any body have the same problem? What can I do to fix this?
  • Router Signal/Internet Issue Hi, I'm trying to connect my wireless router and I use a USB modem. I have already followed the directions and I can't connect it to the internet. My PS Vita, IPhone and PS3 can pick up the signal and the IP address fine but just can't connect to the internet. Does anyone know how to fix it?
  • No service on iphone 4s at places i used to get perfect signal? I have a verizon iphone 4s and i literally used to get service EVERYWHERE and lately i've barely been getting any. Like at my house, my brother has an iphone 4s too and he gets perfect signal and i sometimes have absolutely none. this just started happening like a week ago, what's going on?